Changelog
*********


Python 3.5.7 release candidate 1
================================

*Release date: 2019-03-03*


Security
--------

* bpo-35746: [CVE-2019-5010] Fix a NULL pointer deref in ssl module.
  The cert parser did not handle CRL distribution points with empty DP
  or URI correctly. A malicious or buggy certificate can result into
  segfault. Vulnerability (TALOS-2018-0758) reported by Colin Read and
  Nicolas Edet of Cisco.

* bpo-34791: The xml.sax and xml.dom.domreg no longer use
  environment variables to override parser implementations when
  sys.flags.ignore_environment is set by -E or -I arguments.

* bpo-34623: CVE-2018-14647: The C accelerated _elementtree module
  now initializes hash randomization salt from _Py_HashSecret instead
  of libexpat's default CSPRNG.


Library
-------

* bpo-33329: Fix multiprocessing regression on newer glibcs

* bpo-33127: The ssl module now compiles with LibreSSL 2.7.1.


Python 3.5.6 final
==================

*Release date: 2018-08-02*

There were no changes between 3.5.6rc1 and 3.5.6 final.


Python 3.5.6 release candidate 1
================================

*Release date: 2018-07-19*


Security
--------

* bpo-33001: Minimal fix to prevent buffer overrun in os.symlink on
  Windows

* bpo-32981: Regexes in difflib and poplib were vulnerable to
  catastrophic backtracking. These regexes formed potential DOS
  vectors (REDOS). They have been refactored. This resolves
  CVE-2018-1060 and CVE-2018-1061. Patch by Jamie Davis.


Documentation
-------------

* bpo-33216: Clarify the documentation for CALL_FUNCTION_VAR,
  CALL_FUNCTION_KW, and CALL_FUNCTION_VAR_KW.


Python 3.5.5 final
==================

*Release date: 2018-02-04*

There were no new changes in version 3.5.5.


Python 3.5.5 release candidate 1
================================

*Release date: 2018-01-23*


Security
--------

* bpo-32551: The "sys.path[0]" initialization change for bpo-29139
  caused a regression by revealing an inconsistency in how sys.path is
  initialized when executing "__main__" from a zipfile, directory, or
  other import location. This is considered a potential security
  issue, as it may lead to privileged processes unexpectedly loading
  code from user controlled directories in situations where that was
  not previously the case.

  The interpreter now consistently avoids ever adding the import
  location's parent directory to "sys.path", and ensures no other
  "sys.path" entries are inadvertently modified when inserting the
  import location named on the command line. (Originally reported as
  bpo-29723 against Python 3.6rc1, but it was missed at the time that
  the then upcoming Python 3.5.4 release would also be affected)

* bpo-30657: Fixed possible integer overflow in
  PyBytes_DecodeEscape, CVE-2017-1000158. Original patch by Jay
  Bosamiya; rebased to Python 3 by Miro Hrončok.

* bpo-30947: Upgrade libexpat embedded copy from version 2.2.1 to
  2.2.3 to get security fixes.


Core and Builtins
-----------------

* bpo-31095: Fix potential crash during GC caused by "tp_dealloc"
  which doesn't call "PyObject_GC_UnTrack()".


Library
-------

* bpo-32072: Fixed issues with binary plists:

  * Fixed saving bytearrays.

  * Identical objects will be saved only once.

  * Equal references will be load as identical objects.

  * Added support for saving and loading recursive data structures.

* bpo-31170: expat: Update libexpat from 2.2.3 to 2.2.4. Fix copying
  of partial characters for UTF-8 input (libexpat bug 115):
  https://github.com/libexpat/libexpat/issues/115


Python 3.5.4 final
==================

*Release date: 2017-08-07*


Library
-------

* bpo-30119: ftplib.FTP.putline() now throws ValueError on commands
  that contains CR or LF. Patch by Dong-hee Na.


Python 3.5.4 release candidate 1
================================

*Release date: 2017-07-23*


Security
--------

* bpo-30730: Prevent environment variables injection in subprocess
  on Windows.  Prevent passing other environment variables and command
  arguments.

* bpo-30694: Upgrade expat copy from 2.2.0 to 2.2.1 to get fixes of
  multiple security vulnerabilities including: CVE-2017-9233 (External
  entity infinite loop DoS), CVE-2016-9063 (Integer overflow, re-fix),
  CVE-2016-0718 (Fix regression bugs from 2.2.0's fix to
  CVE-2016-0718) and CVE-2012-0876 (Counter hash flooding with
  SipHash). Note: the CVE-2016-5300 (Use os- specific entropy sources
  like getrandom) doesn't impact Python, since Python already gets
  entropy from the OS to set the expat secret using
  "XML_SetHashSalt()".

* bpo-30500: Fix urllib.parse.splithost() to correctly parse
  fragments. For example, "splithost('//127.0.0.1#@evil.com/')" now
  correctly returns the "127.0.0.1" host, instead of treating
  "@evil.com" as the host in an authentification ("login@host").

* bpo-29591: Update expat copy from 2.1.1 to 2.2.0 to get fixes of
  CVE-2016-0718 and CVE-2016-4472. See
  https://sourceforge.net/p/expat/bugs/537/ for more information.


Core and Builtins
-----------------

* bpo-30876: Relative import from unloaded package now reimports the
  package instead of failing with SystemError.  Relative import from
  non-package now fails with ImportError rather than SystemError.

* bpo-30765: Avoid blocking in pthread_mutex_lock() when
  PyThread_acquire_lock() is asked not to block.

* bpo-27945: Fixed various segfaults with dict when input
  collections are mutated during searching, inserting or comparing.
  Based on patches by Duane Griffin and Tim Mitchell.

* bpo-25794: Fixed type.__setattr__() and type.__delattr__() for
  non- interned attribute names.  Based on patch by Eryk Sun.

* bpo-29935: Fixed error messages in the index() method of tuple,
  list and deque when pass indices of wrong type.

* bpo-28876: "bool(range)" works even if "len(range)" raises
  "OverflowError".

* bpo-29600: Fix wrapping coroutine return values in StopIteration.

* bpo-29537: Restore runtime compatibility with bytecode files
  generated by CPython 3.5.0 to 3.5.2, and adjust the eval loop to
  avoid the problems that could be caused by the malformed variant of
  the BUILD_MAP_UNPACK_WITH_CALL opcode that they may contain. Patch
  by Petr Viktorin, Serhiy Storchaka, and Nick Coghlan.

* bpo-28598: Support __rmod__ for subclasses of str being called
  before str.__mod__. Patch by Martijn Pieters.

* bpo-29602: Fix incorrect handling of signed zeros in complex
  constructor for complex subclasses and for inputs having a
  __complex__ method. Patch by Serhiy Storchaka.

* bpo-29347: Fixed possibly dereferencing undefined pointers when
  creating weakref objects.

* bpo-29438: Fixed use-after-free problem in key sharing dict.

* bpo-29319: Prevent RunMainFromImporter overwriting sys.path[0].

* bpo-29337: Fixed possible BytesWarning when compare the code
  objects. Warnings could be emitted at compile time.

* bpo-29478: If max_line_length=None is specified while using the
  Compat32 policy, it is no longer ignored.  Patch by Mircea Cosbuc.


Library
-------

* bpo-29403: Fix "unittest.mock"'s autospec to not fail on method-
  bound builtin functions.  Patch by Aaron Gallagher.

* bpo-30961: Fix decrementing a borrowed reference in tracemalloc.

* bpo-30886: Fix multiprocessing.Queue.join_thread(): it now waits
  until the thread completes, even if the thread was started by the
  same process which created the queue.

* bpo-29854: Fix segfault in readline when using readline's history-
  size option.  Patch by Nir Soffer.

* bpo-30807: signal.setitimer() may disable the timer when passed a
  tiny value.

  Tiny values (such as 1e-6) are valid non-zero values for
  setitimer(), which is specified as taking microsecond-resolution
  intervals. However, on some platform, our conversion routine could
  convert 1e-6 into a zero interval, therefore disabling the timer
  instead of (re-)scheduling it.

* bpo-30441: Fix bug when modifying os.environ while iterating over
  it

* bpo-30532: Fix email header value parser dropping folding white
  space in certain cases.

* bpo-29169: Update zlib to 1.2.11.

* bpo-30879: os.listdir() and os.scandir() now emit bytes names when
  called with bytes- like argument.

* bpo-30746: Prohibited the '=' character in environment variable
  names in "os.putenv()" and "os.spawn*()".

* bpo-29755: Fixed the lgettext() family of functions in the gettext
  module. They now always return bytes.

* bpo-30645: Fix path calculation in imp.load_package(), fixing it
  for cases when a package is only shipped with bytecodes. Patch by
  Alexandru Ardelean.

* bpo-23890: unittest.TestCase.assertRaises() now manually breaks a
  reference cycle to not keep objects alive longer than expected.

* bpo-30149: inspect.signature() now supports callables with
  variable- argument parameters wrapped with partialmethod. Patch by
  Dong-hee Na.

* bpo-29931: Fixed comparison check for ipaddress.ip_interface
  objects. Patch by Sanjay Sundaresan.

* bpo-24484: Avoid race condition in multiprocessing cleanup.

* bpo-28994: The traceback no longer displayed for SystemExit raised
  in a callback registered by atexit.

* bpo-30508: Don't log exceptions if Task/Future "cancel()" method
  was called.

* bpo-28556: Updates to typing module: Add generic
  AsyncContextManager, add support for ContextManager on all versions.
  Original PRs by Jelle Zijlstra and Ivan Levkivskyi

* bpo-29870: Fix ssl sockets leaks when connection is aborted in
  asyncio/ssl implementation. Patch by Michaël Sghaïer.

* bpo-29743: Closing transport during handshake process leaks open
  socket. Patch by Nikolay Kim

* bpo-27585: Fix waiter cancellation in asyncio.Lock. Patch by
  Mathieu Sornay.

* bpo-30418: On Windows, subprocess.Popen.communicate() now also
  ignore EINVAL on stdin.write() if the child process is still running
  but closed the pipe.

* bpo-30378: Fix the problem that logging.handlers.SysLogHandler
  cannot handle IPv6 addresses.

* bpo-29960: Preserve generator state when _random.Random.setstate()
  raises an exception. Patch by Bryan Olson.

* bpo-30414: multiprocessing.Queue._feed background running thread
  do not break from main loop on exception.

* bpo-30003: Fix handling escape characters in HZ codec.  Based on
  patch by Ma Lin.

* bpo-30301: Fix AttributeError when using SimpleQueue.empty() under
  *spawn* and *forkserver* start methods.

* bpo-30329: imaplib and poplib now catch the Windows socket
  WSAEINVAL error (code 10022) on shutdown(SHUT_RDWR): An invalid
  operation was attempted. This error occurs sometimes on SSL
  connections.

* bpo-30375: Warnings emitted when compile a regular expression now
  always point to the line in the user code.  Previously they could
  point into inners of the re module if emitted from inside of groups
  or conditionals.

* bpo-30048: Fixed "Task.cancel()" can be ignored when the task is
  running coroutine and the coroutine returned without any more
  "await".

* bpo-29990: Fix range checking in GB18030 decoder.  Original patch
  by Ma Lin.

* bpo-26293: Change resulted because of zipfile breakage. (See also:
  bpo-29094)

* bpo-30243: Removed the __init__ methods of _json's scanner and
  encoder. Misusing them could cause memory leaks or crashes.  Now
  scanner and encoder objects are completely initialized in the
  __new__ methods.

* bpo-30185: Avoid KeyboardInterrupt tracebacks in forkserver helper
  process when Ctrl-C is received.

* bpo-28556: Various updates to typing module: add typing.NoReturn
  type, use WrapperDescriptorType, minor bug-fixes.  Original PRs by
  Jim Fasarakis- Hilliard and Ivan Levkivskyi.

* bpo-30205: Fix getsockname() for unbound AF_UNIX sockets on Linux.

* bpo-30070: Fixed leaks and crashes in errors handling in the
  parser module.

* bpo-30061: Fixed crashes in IOBase methods __next__() and
  readlines() when readline() or __next__() respectively return non-
  sizeable object. Fixed possible other errors caused by not checking
  results of PyObject_Size(), PySequence_Size(), or PyMapping_Size().

* bpo-30068: _io._IOBase.readlines will check if it's closed first
  when hint is present.

* bpo-29694: Fixed race condition in pathlib mkdir with flags
  parents=True. Patch by Armin Rigo.

* bpo-29692: Fixed arbitrary unchaining of RuntimeError exceptions
  in contextlib.contextmanager.  Patch by Siddharth Velankar.

* bpo-29998: Pickling and copying ImportError now preserves name and
  path attributes.

* bpo-29942: Fix a crash in itertools.chain.from_iterable when
  encountering long runs of empty iterables.

* bpo-27863: Fixed multiple crashes in ElementTree caused by race
  conditions and wrong types.

* bpo-28699: Fixed a bug in pools in multiprocessing.pool that
  raising an exception at the very first of an iterable may swallow
  the exception or make the program hang. Patch by Davin Potts and
  Xiang Zhang.

* bpo-25803: Avoid incorrect errors raised by
  Path.mkdir(exist_ok=True) when the OS gives priority to errors such
  as EACCES over EEXIST.

* bpo-29861: Release references to tasks, their arguments and their
  results as soon as they are finished in multiprocessing.Pool.

* bpo-29884: faulthandler: Restore the old sigaltstack during
  teardown. Patch by Christophe Zeitouny.

* bpo-25455: Fixed crashes in repr of recursive buffered file-like
  objects.

* bpo-29800: Fix crashes in partial.__repr__ if the keys of
  partial.keywords are not strings.  Patch by Michael Seifert.

* bpo-29742: get_extra_info() raises exception if get called on
  closed ssl transport. Patch by Nikolay Kim.

* bpo-8256: Fixed possible failing or crashing input() if attributes
  "encoding" or "errors" of sys.stdin or sys.stdout are not set or are
  not strings.

* bpo-28298: Fix a bug that prevented array 'Q', 'L' and 'I' from
  accepting big intables (objects that have __int__) as elements.
  Patch by Oren Milman.

* bpo-29615: SimpleXMLRPCDispatcher no longer chains KeyError (or
  any other exception) to exception(s) raised in the dispatched
  methods. Patch by Petr Motejlek.

* bpo-29704: asyncio.subprocess.SubprocessStreamProtocol no longer
  closes before all pipes are closed.

* bpo-29703: Fix asyncio to support instantiation of new event loops
  in child processes.

* bpo-29376: Fix assertion error in
  threading._DummyThread.is_alive().

* bpo-29110: Fix file object leak in aifc.open() when file is given
  as a filesystem path and is not in valid AIFF format. Patch by
  Anthony Zhang.

* bpo-28961: Fix unittest.mock._Call helper: don't ignore the name
  parameter anymore. Patch written by Jiajun Huang.

* bpo-29532: Altering a kwarg dictionary passed to
  functools.partial() no longer affects a partial object after
  creation.

* bpo-28556: Various updates to typing module: typing.Counter,
  typing.ChainMap, improved ABC caching, etc. Original PRs by Jelle
  Zijlstra, Ivan Levkivskyi, Manuel Krebber, and Łukasz Langa.

* bpo-29100: Fix datetime.fromtimestamp() regression introduced in
  Python 3.6.0: check minimum and maximum years.

* bpo-29519: Fix weakref spewing exceptions during interpreter
  shutdown when used with a rare combination of multiprocessing and
  custom codecs.

* bpo-29416: Prevent infinite loop in pathlib.Path.mkdir

* bpo-29444: Fixed out-of-bounds buffer access in the group() method
  of the match object. Based on patch by WGH.

* bpo-29335: Fix subprocess.Popen.wait() when the child process has
  exited to a stopped instead of terminated state (ex: when under
  ptrace).

* bpo-29290: Fix a regression in argparse that help messages would
  wrap at non-breaking spaces.

* bpo-28735: Fixed the comparison of mock.MagickMock with mock.ANY.

* bpo-29011: Fix an important omission by adding Deque to the typing
  module.

* bpo-29219: Fixed infinite recursion in the repr of uninitialized
  ctypes.CDLL instances.

* bpo-28969: Fixed race condition in C implementation of
  functools.lru_cache. KeyError could be raised when cached function
  with full cache was simultaneously called from differen threads with
  the same uncached arguments.

* bpo-29142: In urllib.request, suffixes in no_proxy environment
  variable with leading dots could match related hostnames again (e.g.
  .b.c matches a.b.c). Patch by Milan Oberkirch.


Documentation
-------------

* bpo-30176: Add missing attribute related constants in curses
  documentation.

* bpo-26985: Add missing info of code object in inspect
  documentation.

* bpo-28929: Link the documentation to its source file on GitHub.

* bpo-25008: Document smtpd.py as effectively deprecated and add a
  pointer to aiosmtpd, a third-party asyncio-based replacement.

* bpo-26355: Add canonical header link on each page to corresponding
  major version of the documentation. Patch by Matthias Bussonnier.

* bpo-29349: Fix Python 2 syntax in code for building the
  documentation.


Tests
-----

* bpo-30822: Fix regrtest command line parser to allow passing -u
  extralargefile to run test_zipfile64.

* bpo-30383: regrtest: Enhance regrtest and backport features from
  the master branch.

  Add options: --coverage, --testdir, --list-tests (list test files,
  don't run them), --list-cases (list test identifiers, don't run
  them, bpo-30523), --matchfile (load a list of test filters from a
  text file, bpo-30540), --slowest (alias to --slow).

  Enhance output: add timestamp, test result, currently running tests,
  "Tests result: xxx" summary with total duration, etc.

  Fix reference leak hunting in regrtest, --huntrleaks: regrtest now
  warms up caches, create explicitly all internal singletons which are
  created on demand to prevent false positives when checking for
  reference leaks. (bpo-30675).

* bpo-30357: test_thread: setUp() now uses support.threading_setup()
  and support.threading_cleanup() to wait until threads complete to
  avoid random side effects on following tests. Initial patch written
  by Grzegorz Grzywacz.

* bpo-28087: Skip test_asyncore and test_eintr poll failures on
  macOS. Skip some tests of select.poll when running on macOS due to
  unresolved issues with the underlying system poll function on some
  macOS versions.

* bpo-30197: Enhanced functions swap_attr() and swap_item() in the
  test.support module. They now work when delete replaced attribute or
  item inside the with statement.  The old value of the attribute or
  item (or None if it doesn't exist) now will be assigned to the
  target of the "as" clause, if there is one.

* bpo-29571: to match the behaviour of the "re.LOCALE" flag,
  test_re.test_locale_flag now uses
  "locale.getpreferredencoding(False)" to determine the candidate
  encoding for the test regex (allowing it to correctly skip the test
  when the default locale encoding is a multi-byte encoding)


Build
-----

* bpo-29243: Prevent unnecessary rebuilding of Python during "make
  test", "make install" and some other make targets when configured
  with "--enable- optimizations".

* bpo-23404: Don't regenerate generated files based on file
  modification time anymore: the action is now explicit. Replace "make
  touch" with "make regen-all".

* bpo-29643: Fix "--enable-optimization" didn't work.


Windows
-------

* bpo-30687: Locate msbuild.exe on Windows when building rather than
  vcvarsall.bat

* bpo-29392: Prevent crash when passing invalid arguments into
  msvcrt module.


C API
-----

* bpo-27867: Function PySlice_GetIndicesEx() is replaced with a
  macro if Py_LIMITED_API is set to the value between 0x03050400 and
  0x03060000 (not including) or 0x03060100 or higher.

* bpo-29083: Fixed the declaration of some public API functions.
  PyArg_VaParse() and PyArg_VaParseTupleAndKeywords() were not
  available in limited API. PyArg_ValidateKeywordArguments(),
  PyArg_UnpackTuple() and Py_BuildValue() were not available in
  limited API of version < 3.3 when PY_SSIZE_T_CLEAN is defined.


Python 3.5.3 final
==================

*Release date: 2017-01-17*

There were no code changes between 3.5.3rc1 and 3.5.3 final.


Python 3.5.3 release candidate 1
================================

*Release date: 2017-01-02*


Core and Builtins
-----------------

* bpo-29073: bytearray formatting no longer truncates on first null
  byte.

* bpo-28932: Do not include <sys/random.h> if it does not exist.

* bpo-28147: Fix a memory leak in split-table dictionaries:
  setattr() must not convert combined table into split table.

* bpo-25677: Correct the positioning of the syntax error caret for
  indented blocks. Based on patch by Michael Layzell.

* bpo-29000: Fixed bytes formatting of octals with zero padding in
  alternate form.

* bpo-28512: Fixed setting the offset attribute of SyntaxError by
  PyErr_SyntaxLocationEx() and PyErr_SyntaxLocationObject().

* bpo-28991: functools.lru_cache() was susceptible to an obscure
  reentrancy bug caused by a monkey-patched len() function.

* bpo-28648: Fixed crash in Py_DecodeLocale() in debug build on Mac
  OS X when decode astral characters.  Patch by Xiang Zhang.

* bpo-19398: Extra slash no longer added to sys.path components in
  case of empty compile- time PYTHONPATH components.

* bpo-28426: Fixed potential crash in PyUnicode_AsDecodedObject() in
  debug build.

* bpo-23782: Fixed possible memory leak in _PyTraceback_Add() and
  exception loss in PyTraceBack_Here().

* bpo-28379: Added sanity checks and tests for
  PyUnicode_CopyCharacters(). Patch by Xiang Zhang.

* bpo-28376: The type of long range iterator is now registered as
  Iterator. Patch by Oren Milman.

* bpo-28376: The constructor of range_iterator now checks that step
  is not 0. Patch by Oren Milman.

* bpo-26906: Resolving special methods of uninitialized type now
  causes implicit initialization of the type instead of a fail.

* bpo-18287: PyType_Ready() now checks that tp_name is not NULL.
  Original patch by Niklas Koep.

* bpo-24098: Fixed possible crash when AST is changed in process of
  compiling it.

* bpo-28350: String constants with null character no longer
  interned.

* bpo-26617: Fix crash when GC runs during weakref callbacks.

* bpo-27942: String constants now interned recursively in tuples and
  frozensets.

* bpo-21578: Fixed misleading error message when ImportError called
  with invalid keyword args.

* bpo-28203: Fix incorrect type in error message from "complex(1.0,
  {2:3})". Patch by Soumya Sharma.

* bpo-27955: Fallback on reading /dev/urandom device when the
  getrandom() syscall fails with EPERM, for example when blocked by
  SECCOMP.

* bpo-28131: Fix a regression in zipimport's compile_source().
  zipimport should use the same optimization level as the interpreter.

* bpo-25221: Fix corrupted result from PyLong_FromLong(0) when
  Python is compiled with NSMALLPOSINTS = 0.

* bpo-25758: Prevents zipimport from unnecessarily encoding a
  filename (patch by Eryk Sun)

* bpo-28189: dictitems_contains no longer swallows compare errors.
  (Patch by Xiang Zhang)

* bpo-27812: Properly clear out a generator's frame's backreference
  to the generator to prevent crashes in frame.clear().

* bpo-27811: Fix a crash when a coroutine that has not been awaited
  is finalized with warnings-as-errors enabled.

* bpo-27587: Fix another issue found by PVS-Studio: Null pointer
  check after use of 'def' in _PyState_AddModule(). Initial patch by
  Christian Heimes.

* bpo-26020: set literal evaluation order did not match documented
  behaviour.

* bpo-27782: Multi-phase extension module import now correctly
  allows the "m_methods" field to be used to add module level
  functions to instances of non-module types returned from
  "Py_create_mod". Patch by Xiang Zhang.

* bpo-27936: The round() function accepted a second None argument
  for some types but not for others.  Fixed the inconsistency by
  accepting None for all numeric types.

* bpo-27487: Warn if a submodule argument to "python -m" or
  runpy.run_module() is found in sys.modules after parent packages are
  imported, but before the submodule is executed.

* bpo-27558: Fix a SystemError in the implementation of "raise"
  statement. In a brand new thread, raise a RuntimeError since there
  is no active exception to reraise. Patch written by Xiang Zhang.

* bpo-27419: Standard __import__() no longer look up "__import__" in
  globals or builtins for importing submodules or "from import". Fixed
  handling an error of non- string package name.

* bpo-27083: Respect the PYTHONCASEOK environment variable under
  Windows.

* bpo-27514: Make having too many statically nested blocks a
  SyntaxError instead of SystemError.

* bpo-27473: Fixed possible integer overflow in bytes and bytearray
  concatenations. Patch by Xiang Zhang.

* bpo-27507: Add integer overflow check in bytearray.extend().
  Patch by Xiang Zhang.

* bpo-27581: Don't rely on wrapping for overflow check in
  PySequence_Tuple().  Patch by Xiang Zhang.

* bpo-27443: __length_hint__() of bytearray iterators no longer
  return a negative integer for a resized bytearray.

* bpo-27942: Fix memory leak in codeobject.c


Library
-------

* bpo-15812: inspect.getframeinfo() now correctly shows the first
  line of a context. Patch by Sam Breese.

* bpo-29094: Offsets in a ZIP file created with extern file object
  and modes "w" and "x" now are relative to the start of the file.

* bpo-13051: Fixed recursion errors in large or resized
  curses.textpad.Textbox.  Based on patch by Tycho Andersen.

* bpo-29119: Fix weakrefs in the pure python version of
  collections.OrderedDict move_to_end() method. Contributed by Andra
  Bogildea.

* bpo-9770: curses.ascii predicates now work correctly with negative
  integers.

* bpo-28427: old keys should not remove new values from
  WeakValueDictionary when collecting from another thread.

* bpo-28923: Remove editor artifacts from Tix.py.

* bpo-28871: Fixed a crash when deallocate deep ElementTree.

* bpo-19542: Fix bugs in WeakValueDictionary.setdefault() and
  WeakValueDictionary.pop() when a GC collection happens in another
  thread.

* bpo-20191: Fixed a crash in resource.prlimit() when pass a
  sequence that doesn't own its elements as limits.

* bpo-28779: multiprocessing.set_forkserver_preload() would crash
  the forkserver process if a preloaded module instantiated some
  multiprocessing objects such as locks.

* bpo-28847: dbm.dumb now supports reading read-only files and no
  longer writes the index file when it is not changed.

* bpo-25659: In ctypes, prevent a crash calling the from_buffer()
  and from_buffer_copy() methods on abstract classes like Array.

* bpo-28732: Fix crash in os.spawnv() with no elements in args

* bpo-28485: Always raise ValueError for negative
  compileall.compile_dir(workers=...) parameter, even when
  multithreading is unavailable.

* bpo-28387: Fixed possible crash in _io.TextIOWrapper deallocator
  when the garbage collector is invoked in other thread.  Based on
  patch by Sebastian Cufre.

* bpo-27517: LZMA compressor and decompressor no longer raise
  exceptions if given empty data twice.  Patch by Benjamin Fogle.

* bpo-28549: Fixed segfault in curses's addch() with ncurses6.

* bpo-28449: tarfile.open() with mode "r" or "r:" now tries to open
  a tar file with compression before trying to open it without
  compression. Otherwise it had 50% chance failed with
  ignore_zeros=True.

* bpo-23262: The webbrowser module now supports Firefox 36+ and
  derived browsers.  Based on patch by Oleg Broytman.

* bpo-27939: Fixed bugs in tkinter.ttk.LabeledScale and
  tkinter.Scale caused by representing the scale as float value
  internally in Tk. tkinter.IntVar now works if float value is set to
  underlying Tk variable.

* bpo-28255: calendar.TextCalendar().prmonth() no longer prints a
  space at the start of new line after printing a month's calendar.
  Patch by Xiang Zhang.

* bpo-20491: The textwrap.TextWrapper class now honors non-breaking
  spaces. Based on patch by Kaarle Ritvanen.

* bpo-28353: os.fwalk() no longer fails on broken links.

* bpo-25464: Fixed HList.header_exists() in tkinter.tix module by
  addin a workaround to Tix library bug.

* bpo-28488: shutil.make_archive() no longer add entry "./" to ZIP
  archive.

* bpo-24452: Make webbrowser support Chrome on Mac OS X.

* bpo-20766: Fix references leaked by pdb in the handling of SIGINT
  handlers.

* bpo-26293: Fixed writing ZIP files that starts not from the start
  of the file.  Offsets in ZIP file now are relative to the start of
  the archive in conforming to the specification.

* bpo-28321: Fixed writing non-BMP characters with binary format in
  plistlib.

* bpo-28322: Fixed possible crashes when unpickle itertools objects
  from incorrect pickle data.  Based on patch by John Leitch.

* Fix possible integer overflows and crashes in the mmap module with
  unusual usage patterns.

* bpo-1703178: Fix the ability to pass the --link-objects option to
  the distutils build_ext command.

* bpo-28253: Fixed calendar functions for extreme months: 0001-01
  and 9999-12.

  Methods itermonthdays() and itermonthdays2() are reimplemented so
  that they don't call itermonthdates() which can cause datetime.date
  under/overflow.

* bpo-28275: Fixed possible use after free in the decompress()
  methods of the LZMADecompressor and BZ2Decompressor classes.
  Original patch by John Leitch.

* bpo-27897: Fixed possible crash in
  sqlite3.Connection.create_collation() if pass invalid string-like
  object as a name.  Patch by Xiang Zhang.

* bpo-18893: Fix invalid exception handling in
  Lib/ctypes/macholib/dyld.py. Patch by Madison May.

* bpo-27611: Fixed support of default root window in the tkinter.tix
  module.

* bpo-27348: In the traceback module, restore the formatting of
  exception messages like "Exception: None".  This fixes a regression
  introduced in 3.5a2.

* bpo-25651: Allow falsy values to be used for msg parameter of
  subTest().

* bpo-27932: Prevent memory leak in win32_ver().

* Fix UnboundLocalError in socket._sendfile_use_sendfile.

* bpo-28075: Check for ERROR_ACCESS_DENIED in Windows implementation
  of os.stat().  Patch by Eryk Sun.

* bpo-25270: Prevent codecs.escape_encode() from raising SystemError
  when an empty bytestring is passed.

* bpo-28181: Get antigravity over HTTPS. Patch by Kaartic Sivaraam.

* bpo-25895: Enable WebSocket URL schemes in urllib.parse.urljoin.
  Patch by Gergely Imreh and Markus Holtermann.

* bpo-27599: Fixed buffer overrun in binascii.b2a_qp() and
  binascii.a2b_qp().

* bpo-19003: m email.generator now replaces only "\r" and/or "\n"
  line endings, per the RFC, instead of all unicode line endings.

* bpo-28019: itertools.count() no longer rounds non-integer step in
  range between 1.0 and 2.0 to 1.

* bpo-25969: Update the lib2to3 grammar to handle the unpacking
  generalizations added in 3.5.

* bpo-14977: mailcap now respects the order of the lines in the
  mailcap files ("first match"), as required by RFC 1542.  Patch by
  Michael Lazar.

* bpo-24594: Validates persist parameter when opening MSI database

* bpo-17582: xml.etree.ElementTree nows preserves whitespaces in
  attributes (Patch by Duane Griffin.  Reviewed and approved by Stefan
  Behnel.)

* bpo-28047: Fixed calculation of line length used for the base64
  CTE in the new email policies.

* bpo-27445: Don't pass str(_charset) to MIMEText.set_payload().
  Patch by Claude Paroz.

* bpo-22450: urllib now includes an "Accept: */*" header among the
  default headers. This makes the results of REST API requests more
  consistent and predictable especially when proxy servers are
  involved.

* lib2to3.pgen3.driver.load_grammar() now creates a stable cache
  file between runs given the same Grammar.txt input regardless of the
  hash randomization setting.

* bpo-27570: Avoid zero-length memcpy() etc calls with null source
  pointers in the "ctypes" and "array" modules.

* bpo-22233: Break email header lines *only* on the RFC specified CR
  and LF characters, not on arbitrary unicode line breaks.  This also
  fixes a bug in HTTP header parsing.

* bpo-27988: Fix email iter_attachments incorrect mutation of
  payload list.

* bpo-27691: Fix ssl module's parsing of GEN_RID subject alternative
  name fields in X.509 certs.

* bpo-27850: Remove 3DES from ssl module's default cipher list to
  counter measure sweet32 attack (CVE-2016-2183).

* bpo-27766: Add ChaCha20 Poly1305 to ssl module's default ciper
  list. (Required OpenSSL 1.1.0 or LibreSSL).

* bpo-26470: Port ssl and hashlib module to OpenSSL 1.1.0.

* Remove support for passing a file descriptor to os.access. It
  never worked but previously didn't raise.

* bpo-12885: Fix error when distutils encounters symlink.

* bpo-27881: Fixed possible bugs when setting
  sqlite3.Connection.isolation_level. Based on patch by Xiang Zhang.

* bpo-27861: Fixed a crash in sqlite3.Connection.cursor() when a
  factory creates not a cursor.  Patch by Xiang Zhang.

* bpo-19884: Avoid spurious output on OS X with Gnu Readline.

* bpo-27706: Restore deterministic behavior of
  random.Random().seed() for string seeds using seeding version 1.
  Allows sequences of calls to random() to exactly match those
  obtained in Python 2. Patch by Nofar Schnider.

* bpo-10513: Fix a regression in Connection.commit().  Statements
  should not be reset after a commit.

* A new version of typing.py from https://github.com/python/typing:
  - Collection (only for 3.6) (bpo-27598) - Add FrozenSet to __all__
  (upstream #261) - fix crash in _get_type_vars() (upstream #259) -
  Remove the dict constraint in ForwardRef._eval_type (upstream #252)

* bpo-27539: Fix unnormalised "Fraction.__pow__" result in the case
  of negative exponent and negative base.

* bpo-21718: cursor.description is now available for queries using
  CTEs.

* bpo-2466: posixpath.ismount now correctly recognizes mount points
  which the user does not have permission to access.

* bpo-27773: Correct some memory management errors server_hostname
  in _ssl.wrap_socket().

* bpo-26750: unittest.mock.create_autospec() now works properly for
  subclasses of property() and other data descriptors.

* In the curses module, raise an error if window.getstr() or
  window.instr() is passed a negative value.

* bpo-27783: Fix possible usage of uninitialized memory in
  operator.methodcaller.

* bpo-27774: Fix possible Py_DECREF on unowned object in _sre.

* bpo-27760: Fix possible integer overflow in binascii.b2a_qp.

* bpo-27758: Fix possible integer overflow in the _csv module for
  large record lengths.

* bpo-27568: Prevent HTTPoxy attack (CVE-2016-1000110). Ignore the
  HTTP_PROXY variable when REQUEST_METHOD environment is set, which
  indicates that the script is in CGI mode.

* bpo-27656: Do not assume sched.h defines any SCHED_* constants.

* bpo-27130: In the "zlib" module, fix handling of large buffers
  (typically 4 GiB) when compressing and decompressing.  Previously,
  inputs were limited to 4 GiB, and compression and decompression
  operations did not properly handle results of 4 GiB.

* bpo-27533: Release GIL in nt._isdir

* bpo-17711: Fixed unpickling by the persistent ID with protocol 0.
  Original patch by Alexandre Vassalotti.

* bpo-27522: Avoid an unintentional reference cycle in
  email.feedparser.

* bpo-26844: Fix error message for imp.find_module() to refer to
  'path' instead of 'name'. Patch by Lev Maximov.

* bpo-23804: Fix SSL zero-length recv() calls to not block and not
  raise an error about unclean EOF.

* bpo-27466: Change time format returned by
  http.cookie.time2netscape, confirming the netscape cookie format and
  making it consistent with documentation.

* bpo-26664: Fix activate.fish by removing mis-use of "$".

* bpo-22115: Fixed tracing Tkinter variables: trace_vdelete() with
  wrong mode no longer break tracing, trace_vinfo() now always returns
  a list of pairs of strings, tracing in the "u" mode now works.

* Fix a scoping issue in importlib.util.LazyLoader which triggered
  an UnboundLocalError when lazy-loading a module that was already put
  into sys.modules.

* bpo-27079: Fixed curses.ascii functions isblank(), iscntrl() and
  ispunct().

* bpo-26754: Some functions (compile() etc) accepted a filename
  argument encoded as an iterable of integers. Now only strings and
  byte-like objects are accepted.

* bpo-27048: Prevents distutils failing on Windows when environment
  variables contain non-ASCII characters

* bpo-27330: Fixed possible leaks in the ctypes module.

* bpo-27238: Got rid of bare excepts in the turtle module.  Original
  patch by Jelle Zijlstra.

* bpo-27122: When an exception is raised within the context being
  managed by a contextlib.ExitStack() and one of the exit stack
  generators catches and raises it in a chain, do not re-raise the
  original exception when exiting, let the new chained one through.
  This avoids the PEP 479 bug described in issue25782.


Security
--------

* bpo-27278: Fix os.urandom() implementation using getrandom() on
  Linux. Truncate size to INT_MAX and loop until we collected enough
  random bytes, instead of casting a directly Py_ssize_t to int.


Library
-------

* bpo-26386: Fixed ttk.TreeView selection operations with item id's
  containing spaces.


Security
--------

* bpo-22636: Avoid shell injection problems with
  ctypes.util.find_library().


Library
-------

* bpo-16182: Fix various functions in the "readline" module to use
  the locale encoding, and fix get_begidx() and get_endidx() to return
  code point indexes.

* bpo-27392: Add loop.connect_accepted_socket(). Patch by Jim
  Fulton.

* bpo-27930: Improved behaviour of logging.handlers.QueueListener.
  Thanks to Paulo Andrade and Petr Viktorin for the analysis and
  patch.

* bpo-21201: Improves readability of multiprocessing error message.
  Thanks to Wojciech Walczak for patch.

* bpo-27456: asyncio: Set TCP_NODELAY by default.

* bpo-27906: Fix socket accept exhaustion during high TCP traffic.
  Patch by Kevin Conway.

* bpo-28174: Handle when SO_REUSEPORT isn't properly supported.
  Patch by Seth Michael Larson.

* bpo-26654: Inspect functools.partial in asyncio.Handle.__repr__.
  Patch by iceboy.

* bpo-26909: Fix slow pipes IO in asyncio. Patch by INADA Naoki.

* bpo-28176: Fix callbacks race in
  asyncio.SelectorLoop.sock_connect.

* bpo-27759: Fix selectors incorrectly retain invalid file
  descriptors. Patch by Mark Williams.

* bpo-28368: Refuse monitoring processes if the child watcher has no
  loop attached. Patch by Vincent Michel.

* bpo-28369: Raise RuntimeError when transport's FD is used with
  add_reader, add_writer, etc.

* bpo-28370: Speedup asyncio.StreamReader.readexactly. Patch by
  Коренберг Марк.

* bpo-28371: Deprecate passing asyncio.Handles to run_in_executor.

* bpo-28372: Fix asyncio to support formatting of non-python
  coroutines.

* bpo-28399: Remove UNIX socket from FS before binding. Patch by
  Коренберг Марк.

* bpo-27972: Prohibit Tasks to await on themselves.

* bpo-26923: Fix asyncio.Gather to refuse being cancelled once all
  children are done. Patch by Johannes Ebke.

* bpo-26796: Don't configure the number of workers for default
  threadpool executor. Initial patch by Hans Lawrenz.

* bpo-28600: Optimize loop.call_soon().

* bpo-28613: Fix get_event_loop() return the current loop if called
  from coroutines/callbacks.

* bpo-28639: Fix inspect.isawaitable to always return bool Patch by
  Justin Mayfield.

* bpo-28652: Make loop methods reject socket kinds they do not
  support.

* bpo-28653: Fix a refleak in functools.lru_cache.

* bpo-28703: Fix asyncio.iscoroutinefunction to handle Mock objects.

* bpo-24142: Reading a corrupt config file left the parser in an
  invalid state.  Original patch by Florian Höch.

* bpo-28990: Fix SSL hanging if connection is closed before
  handshake completed. (Patch by HoHo-Ho)


IDLE
----

* bpo-15308: Add 'interrupt execution' (^C) to Shell menu. Patch by
  Roger Serwy, updated by Bayard Randel.

* bpo-27922: Stop IDLE tests from 'flashing' gui widgets on the
  screen.

* Add version to title of IDLE help window.

* bpo-25564: In section on IDLE -- console differences, mention that
  using exec means that __builtins__ is defined for each statement.

* bpo-27714: text_textview and test_autocomplete now pass when re-
  run in the same process.  This occurs when test_idle fails when run
  with the -w option but without -jn.  Fix warning from test_config.

* bpo-25507: IDLE no longer runs buggy code because of its tkinter
  imports. Users must include the same imports required to run
  directly in Python.

* bpo-27452: add line counter and crc to IDLE configHandler test
  dump.

* bpo-27365: Allow non-ascii chars in IDLE NEWS.txt, for contributor
  names.

* bpo-27245: IDLE: Cleanly delete custom themes and key bindings.
  Previously, when IDLE was started from a console or by import, a
  cascade of warnings was emitted. Patch by Serhiy Storchaka.


C API
-----

* bpo-28808: PyUnicode_CompareWithASCIIString() now never raises
  exceptions.

* bpo-26754: PyUnicode_FSDecoder() accepted a filename argument
  encoded as an iterable of integers. Now only strings and bytes-like
  objects are accepted.


Documentation
-------------

* bpo-28513: Documented command-line interface of zipfile.


Tests
-----

* bpo-28950: Disallow -j0 to be combined with -T/-l/-M in regrtest
  command line arguments.

* bpo-28666: Now test.support.rmtree is able to remove unwritable or
  unreadable directories.

* bpo-23839: Various caches now are cleared before running every
  test file.

* bpo-28409: regrtest: fix the parser of command line arguments.

* bpo-27787: Call gc.collect() before checking each test for
  "dangling threads", since the dangling threads are weak references.

* bpo-27369: In test_pyexpat, avoid testing an error message detail
  that changed in Expat 2.2.0.


Tools/Demos
-----------

* bpo-27952: Get Tools/scripts/fixcid.py working with Python 3 and
  the current "re" module, avoid invalid Python backslash escapes, and
  fix a bug parsing escaped C quote signs.

* bpo-27332: Fixed the type of the first argument of module-level
  functions generated by Argument Clinic.  Patch by Petr Viktorin.

* bpo-27418: Fixed Tools/importbench/importbench.py.


Windows
-------

* bpo-28251: Improvements to help manuals on Windows.

* bpo-28110: launcher.msi has different product codes between 32-bit
  and 64-bit

* bpo-25144: Ensures TargetDir is set before continuing with custom
  install.

* bpo-27469: Adds a shell extension to the launcher so that drag and
  drop works correctly.

* bpo-27309: Enabled proper Windows styles in python[w].exe
  manifest.


Build
-----

* bpo-29080: Removes hard dependency on hg.exe from
  PCBuild/build.bat

* bpo-23903: Added missed names to PC/python3.def.

* bpo-10656: Fix out-of-tree building on AIX.  Patch by Tristan
  Carel and Michael Haubenwallner.

* bpo-26359: Rename --with-optimiations to --enable-optimizations.

* bpo-28444: Fix missing extensions modules when cross compiling.

* bpo-28248: Update Windows build and OS X installers to use OpenSSL
  1.0.2j.

* bpo-28258: Fixed build with Estonian locale (python-config and
  distclean targets in Makefile).  Patch by Arfrever Frehtes Taifersar
  Arahesis.

* bpo-26661: setup.py now detects system libffi with multiarch
  wrapper.

* bpo-28066: Fix the logic that searches build directories for
  generated include files when building outside the source tree.

* bpo-15819: Remove redundant include search directory option for
  building outside the source tree.

* bpo-27566: Fix clean target in freeze makefile (patch by Lisa
  Roach)

* bpo-27705: Update message in validate_ucrtbase.py

* bpo-27983: Cause lack of llvm-profdata tool when using clang as
  required for PGO linking to be a configure time error rather than
  make time when --with- optimizations is enabled.  Also improve our
  ability to find the llvm- profdata tool on MacOS and some Linuxes.

* bpo-26307: The profile-opt build now applies PGO to the built-in
  modules.

* bpo-26359: Add the --with-optimizations configure flag.

* bpo-27713: Suppress spurious build warnings when updating
  importlib's bootstrap files. Patch by Xiang Zhang

* bpo-25825: Correct the references to Modules/python.exp and
  ld_so_aix, which are required on AIX.  This updates references to an
  installation path that was changed in 3.2a4, and undoes changed
  references to the build tree that were made in 3.5.0a1.

* bpo-27453: CPP invocation in configure must use CPPFLAGS. Patch by
  Chi Hsuan Yen.

* bpo-27641: The configure script now inserts comments into the
  makefile to prevent the pgen and _freeze_importlib executables from
  being cross- compiled.

* bpo-26662: Set PYTHON_FOR_GEN in configure as the Python program
  to be used for file generation during the build.

* bpo-10910: Avoid C++ compilation errors on FreeBSD and OS X. Also
  update FreedBSD version checks for the original ctype UTF-8
  workaround.

* bpo-28676: Prevent missing 'getentropy' declaration warning on
  macOS. Patch by Gareth Rees.


Python 3.5.2 final
==================

*Release date: 2016-06-26*


Core and Builtins
-----------------

* bpo-26930: Update Windows builds to use OpenSSL 1.0.2h.


Tests
-----

* bpo-26867: Ubuntu's openssl OP_NO_SSLv3 is forced on by default;
  fix test.


IDLE
----

* bpo-27365: Allow non-ascii in idlelib/NEWS.txt - minimal part for
  3.5.2.


Python 3.5.2 release candidate 1
================================

*Release date: 2016-06-12*


Core and Builtins
-----------------

* bpo-27066: Fixed SystemError if a custom opener (for open())
  returns a negative number without setting an exception.

* bpo-20041: Fixed TypeError when frame.f_trace is set to None.
  Patch by Xavier de Gaye.

* bpo-26168: Fixed possible refleaks in failing Py_BuildValue() with
  the "N" format unit.

* bpo-26991: Fix possible refleak when creating a function with
  annotations.

* bpo-27039: Fixed bytearray.remove() for values greater than 127.
  Patch by Joe Jevnik.

* bpo-23640: int.from_bytes() no longer bypasses constructors for
  subclasses.

* bpo-26811: gc.get_objects() no longer contains a broken tuple with
  NULL pointer.

* bpo-20120: Use RawConfigParser for .pypirc parsing, removing
  support for interpolation unintentionally added with move to Python
  3. Behavior no longer does any interpolation in .pypirc files,
  matching behavior in Python 2.7 and Setuptools 19.0.

* bpo-26659: Make the builtin slice type support cycle collection.

* bpo-26718: super.__init__ no longer leaks memory if called
  multiple times. NOTE: A direct call of super.__init__ is not
  endorsed!

* bpo-25339: PYTHONIOENCODING now has priority over locale in
  setting the error handler for stdin and stdout.

* bpo-26494: Fixed crash on iterating exhausting iterators. Affected
  classes are generic sequence iterators, iterators of str, bytes,
  bytearray, list, tuple, set, frozenset, dict, OrderedDict,
  corresponding views and os.scandir() iterator.

* bpo-26581: If coding cookie is specified multiple times on a line
  in Python source code file, only the first one is taken to account.

* bpo-26464: Fix str.translate() when string is ASCII and first
  replacements removes character, but next replacement uses a non-
  ASCII character or a string longer than 1 character. Regression
  introduced in Python 3.5.0.

* bpo-22836: Ensure exception reports from PyErr_Display() and
  PyErr_WriteUnraisable() are sensible even when formatting them
  produces secondary errors.  This affects the reports produced by
  sys.__excepthook__() and when __del__() raises an exception.

* bpo-26302: Correct behavior to reject comma as a legal character
  for cookie names.

* bpo-4806: Avoid masking the original TypeError exception when
  using star ("*") unpacking in function calls.  Based on patch by
  Hagen Fürstenau and Daniel Urban.

* bpo-27138: Fix the doc comment for FileFinder.find_spec().

* bpo-26154: Add a new private _PyThreadState_UncheckedGet()
  function to get the current Python thread state, but don't issue a
  fatal error if it is NULL. This new function must be used instead of
  accessing directly the _PyThreadState_Current variable.  The
  variable is no more exposed since Python 3.5.1 to hide the exact
  implementation of atomic C types, to avoid compiler issues.

* bpo-26194: Deque.insert() gave odd results for bounded deques that
  had reached their maximum size.  Now an IndexError will be raised
  when attempting to insert into a full deque.

* bpo-25843: When compiling code, don't merge constants if they are
  equal but have a different types. For example, "f1, f2 = lambda: 1,
  lambda: 1.0" is now correctly compiled to two different functions:
  "f1()" returns "1" ("int") and "f2()" returns "1.0" ("int"), even if
  "1" and "1.0" are equal.

* bpo-22995: [UPDATE] Comment out the one of the pickleability tests
  in _PyObject_GetState() due to regressions observed in Cython-based
  projects.

* bpo-25961: Disallowed null characters in the type name.

* bpo-25973: Fix segfault when an invalid nonlocal statement binds a
  name starting with two underscores.

* bpo-22995: Instances of extension types with a state that aren't
  subclasses of list or dict and haven't implemented any pickle-
  related methods (__reduce__, __reduce_ex__, __getnewargs__,
  __getnewargs_ex__, or __getstate__), can no longer be pickled.
  Including memoryview.

* bpo-20440: Massive replacing unsafe attribute setting code with
  special macro Py_SETREF.

* bpo-25766: Special method __bytes__() now works in str subclasses.

* bpo-25421: __sizeof__ methods of builtin types now use dynamic
  basic size. This allows sys.getsize() to work correctly with their
  subclasses with __slots__ defined.

* bpo-25709: Fixed problem with in-place string concatenation and
  utf-8 cache.

* bpo-27147: Mention PEP 420 in the importlib docs.

* bpo-24097: Fixed crash in object.__reduce__() if slot name is
  freed inside __getattr__.

* bpo-24731: Fixed crash on converting objects with special methods
  __bytes__, __trunc__, and __float__ returning instances of
  subclasses of bytes, int, and float to subclasses of bytes, int, and
  float correspondingly.

* bpo-26478: Fix semantic bugs when using binary operators with
  dictionary views and tuples.

* bpo-26171: Fix possible integer overflow and heap corruption in
  zipimporter.get_data().

* bpo-25660: Fix TAB key behaviour in REPL with readline.

* bpo-25887: Raise a RuntimeError when a coroutine object is awaited
  more than once.

* bpo-27243: Update the __aiter__ protocol: instead of returning an
  awaitable that resolves to an asynchronous iterator, the
  asynchronous iterator should be returned directly.  Doing the former
  will trigger a PendingDeprecationWarning.


Security
--------

* bpo-26556: Update expat to 2.1.1, fixes CVE-2015-1283.

* Fix TLS stripping vulnerability in smtplib, CVE-2016-0772.
  Reported by Team Oststrom


Library
-------

* bpo-21386: Implement missing IPv4Address.is_global property.  It
  was documented since 07a5610bae9d.  Initial patch by Roger Luethi.

* bpo-20900: distutils register command now decodes HTTP responses
  correctly.  Initial patch by ingrid.

* A new version of typing.py provides several new classes and
  features: @overload outside stubs, Reversible, DefaultDict, Text,
  ContextManager, Type[], NewType(), TYPE_CHECKING, and numerous bug
  fixes (note that some of the new features are not yet implemented in
  mypy or other static analyzers). Also classes for PEP 492
  (Awaitable, AsyncIterable, AsyncIterator) have been added (in fact
  they made it into 3.5.1 but were never mentioned).

* bpo-25738: Stop http.server.BaseHTTPRequestHandler.send_error()
  from sending a message body for 205 Reset Content.  Also, don't send
  Content header fields in responses that don't have a body.  Patch by
  Susumu Koshiba.

* bpo-21313: Fix the "platform" module to tolerate when sys.version
  contains truncated build information.


Security
--------

* bpo-26839: On Linux, "os.urandom()" now calls "getrandom()" with
  "GRND_NONBLOCK" to fall back on reading "/dev/urandom" if the
  urandom entropy pool is not initialized yet. Patch written by Colm
  Buckley.


Library
-------

* bpo-27164: In the zlib module, allow decompressing raw Deflate
  streams with a predefined zdict.  Based on patch by Xiang Zhang.

* bpo-24291: Fix wsgiref.simple_server.WSGIRequestHandler to
  completely write data to the client.  Previously it could do partial
  writes and truncate data.  Also, wsgiref.handler.ServerHandler can
  now handle stdout doing partial writes, but this is deprecated.

* bpo-26809: Add "__all__" to "string".  Patch by Emanuel Barry.

* bpo-26373: subprocess.Popen.communicate now correctly ignores
  BrokenPipeError when the child process dies before .communicate() is
  called in more/all circumstances.

* bpo-21776: distutils.upload now correctly handles HTTPError.
  Initial patch by Claudiu Popa.

* bpo-27114: Fix SSLContext._load_windows_store_certs fails with
  PermissionError

* bpo-18383: Avoid creating duplicate filters when using
  filterwarnings and simplefilter. Based on patch by Alex Shkop.

* bpo-27057: Fix os.set_inheritable() on Android, ioctl() is blocked
  by SELinux and fails with EACCESS. The function now falls back to
  fcntl(). Patch written by Michał Bednarski.

* bpo-27014: Fix infinite recursion using typing.py.  Thanks to
  Kalle Tuure!

* bpo-14132: Fix urllib.request redirect handling when the target
  only has a query string.  Original fix by Ján Janech.

* bpo-17214: The "urllib.request" module now percent-encodes non-
  ASCII bytes found in redirect target URLs.  Some servers send
  Location header fields with non- ASCII bytes, but "http.client"
  requires the request target to be ASCII- encodable, otherwise a
  UnicodeEncodeError is raised.  Based on patch by Christian Heimes.

* bpo-26892: Honor debuglevel flag in urllib.request.HTTPHandler.
  Patch contributed by Chi Hsuan Yen.

* bpo-22274: In the subprocess module, allow stderr to be redirected
  to stdout even when stdout is not redirected.  Patch by Akira Li.

* bpo-26807: mock_open 'files' no longer error on readline at end of
  file. Patch from Yolanda Robla.

* bpo-25745: Fixed leaking a userptr in curses panel destructor.

* bpo-26977: Removed unnecessary, and ignored, call to sum of
  squares helper in statistics.pvariance.

* bpo-26881: The modulefinder module now supports extended opcode
  arguments.

* bpo-23815: Fixed crashes related to directly created instances of
  types in _tkinter and curses.panel modules.

* bpo-17765: weakref.ref() no longer silently ignores keyword
  arguments. Patch by Georg Brandl.

* bpo-26873: xmlrpc now raises ResponseError on unsupported type
  tags instead of silently return incorrect result.

* bpo-26711: Fixed the comparison of plistlib.Data with other types.

* bpo-24114: Fix an uninitialized variable in "ctypes.util".

  The bug only occurs on SunOS when the ctypes implementation searches
  for the "crle" program.  Patch by Xiang Zhang.  Tested on SunOS by
  Kees Bos.

* bpo-26864: In urllib.request, change the proxy bypass host
  checking against no_proxy to be case-insensitive, and to not match
  unrelated host names that happen to have a bypassed hostname as a
  suffix. Patch by Xiang Zhang.

* bpo-26634: recursive_repr() now sets __qualname__ of wrapper.
  Patch by Xiang Zhang.

* bpo-26804: urllib.request will prefer lower_case proxy environment
  variables over UPPER_CASE or Mixed_Case ones. Patch contributed by
  Hans-Peter Jansen.

* bpo-26837: assertSequenceEqual() now correctly outputs non-
  stringified differing items (like bytes in the -b mode).  This
  affects assertListEqual() and assertTupleEqual().

* bpo-26041: Remove "will be removed in Python 3.7" from deprecation
  messages of platform.dist() and platform.linux_distribution(). Patch
  by Kumaripaba Miyurusara Athukorala.

* bpo-26822: itemgetter, attrgetter and methodcaller objects no
  longer silently ignore keyword arguments.

* bpo-26733: Disassembling a class now disassembles class and static
  methods. Patch by Xiang Zhang.

* bpo-26801: Fix error handling in "shutil.get_terminal_size()",
  catch "AttributeError" instead of "NameError". Patch written by
  Emanuel Barry.

* bpo-24838: tarfile's ustar and gnu formats now correctly calculate
  name and link field limits for multibyte character encodings like
  utf-8.


Security
--------

* bpo-26657: Fix directory traversal vulnerability with http.server
  on Windows.  This fixes a regression that was introduced in 3.3.4rc1
  and 3.4.0rc1.  Based on patch by Philipp Hagemeister.


Library
-------

* bpo-26717: Stop encoding Latin-1-ized WSGI paths with UTF-8.
  Patch by Anthony Sottile.

* bpo-26735: Fix "os.urandom()" on Solaris 11.3 and newer when
  reading more than 1,024 bytes: call "getrandom()" multiple times
  with a limit of 1024 bytes per call.

* bpo-16329: Add .webm to mimetypes.types_map.  Patch by Giampaolo
  Rodola'.

* bpo-13952: Add .csv to mimetypes.types_map.  Patch by Geoff
  Wilson.

* bpo-26709: Fixed Y2038 problem in loading binary PLists.

* bpo-23735: Handle terminal resizing with Readline 6.3+ by
  installing our own SIGWINCH handler.  Patch by Eric Price.

* bpo-26586: In http.server, respond with "413 Request header fields
  too large" if there are too many header fields to parse, rather than
  killing the connection and raising an unhandled exception.  Patch by
  Xiang Zhang.

* bpo-22854: Change BufferedReader.writable() and
  BufferedWriter.readable() to always return False.

* bpo-25195: Fix a regression in mock.MagicMock. _Call is a subclass
  of tuple (changeset 3603bae63c13 only works for classes) so we need
  to implement __ne__ ourselves.  Patch by Andrew Plummer.

* bpo-26644: Raise ValueError rather than SystemError when a
  negative length is passed to SSLSocket.recv() or read().

* bpo-23804: Fix SSL recv(0) and read(0) methods to return zero
  bytes instead of up to 1024.

* bpo-26616: Fixed a bug in datetime.astimezone() method.

* bpo-21925: "warnings.formatwarning()" now catches exceptions on
  "linecache.getline(...)" to be able to log "ResourceWarning" emitted
  late during the Python shutdown process.

* bpo-24266: Ctrl+C during Readline history search now cancels the
  search mode when compiled with Readline 7.

* bpo-26560: Avoid potential ValueError in
  BaseHandler.start_response. Initial patch by Peter Inglesby.


Security
--------

* bpo-26313: ssl.py _load_windows_store_certs fails if windows cert
  store is empty. Patch by Baji.


Library
-------

* bpo-26569: Fix "pyclbr.readmodule()" and "pyclbr.readmodule_ex()"
  to support importing packages.

* bpo-26499: Account for remaining Content-Length in
  HTTPResponse.readline() and read1(). Based on patch by Silent Ghost.
  Also document that HTTPResponse now supports these methods.

* bpo-25320: Handle sockets in directories unittest discovery is
  scanning. Patch from Victor van den Elzen.

* bpo-16181: cookiejar.http2time() now returns None if year is
  higher than datetime.MAXYEAR.

* bpo-26513: Fixes platform module detection of Windows Server

* bpo-23718: Fixed parsing time in week 0 before Jan 1.  Original
  patch by Tamás Bence Gedai.

* bpo-20589: Invoking Path.owner() and Path.group() on Windows now
  raise NotImplementedError instead of ImportError.

* bpo-26177: Fixed the keys() method for Canvas and Scrollbar
  widgets.

* bpo-15068: Got rid of excessive buffering in the fileinput module.
  The bufsize parameter is no longer used.

* bpo-2202: Fix UnboundLocalError in
  AbstractDigestAuthHandler.get_algorithm_impls. Initial patch by
  Mathieu Dupuy.

* bpo-25718: Fixed pickling and copying the accumulate() iterator
  with total is None.

* bpo-26475: Fixed debugging output for regular expressions with the
  (?x) flag.

* bpo-26457: Fixed the subnets() methods in IP network classes for
  the case when resulting prefix length is equal to maximal prefix
  length. Based on patch by Xiang Zhang.

* bpo-26385: Remove the file if the internal open() call in
  NamedTemporaryFile() fails. Patch by Silent Ghost.

* bpo-26402: Fix XML-RPC client to retry when the server shuts down
  a persistent connection.  This was a regression related to the new
  http.client.RemoteDisconnected exception in 3.5.0a4.

* bpo-25913: Leading "<~" is optional now in base64.a85decode() with
  adobe=True.  Patch by Swati Jaiswal.

* bpo-26186: Remove an invalid type check in
  importlib.util.LazyLoader.

* bpo-26367: importlib.__import__() raises SystemError like
  builtins.__import__() when "level" is specified but without an
  accompanying package specified.

* bpo-26309: In the "socketserver" module, shut down the request
  (closing the connected socket) when verify_request() returns false.
  Patch by Aviv Palivoda.


Security
--------

* bpo-25939: On Windows open the cert store readonly in
  ssl.enum_certificates.


Library
-------

* bpo-25995: os.walk() no longer uses FDs proportional to the tree
  depth.

* bpo-26117: The os.scandir() iterator now closes file descriptor
  not only when the iteration is finished, but when it was failed with
  error.

* bpo-25911: Restored support of bytes paths in os.walk() on
  Windows.

* bpo-26045: Add UTF-8 suggestion to error message when posting a
  non- Latin-1 string with http.client.

* bpo-12923: Reset FancyURLopener's redirect counter even if there
  is an exception. Based on patches by Brian Brazil and Daniel Rocco.

* bpo-25945: Fixed a crash when unpickle the functools.partial
  object with wrong state. Fixed a leak in failed functools.partial
  constructor. "args" and "keywords" attributes of functools.partial
  have now always types tuple and dict correspondingly.

* bpo-26202: copy.deepcopy() now correctly copies range() objects
  with non-atomic attributes.

* bpo-23076: Path.glob() now raises a ValueError if it's called with
  an invalid pattern. Patch by Thomas Nyberg.

* bpo-19883: Fixed possible integer overflows in zipimport.

* bpo-26227: On Windows, getnameinfo(), gethostbyaddr() and
  gethostbyname_ex() functions of the socket module now decode the
  hostname from the ANSI code page rather than UTF-8.

* bpo-26147: xmlrpc now works with strings not encodable with used
  non-UTF-8 encoding.

* bpo-25935: Garbage collector now breaks reference loops with
  OrderedDict.

* bpo-16620: Fixed AttributeError in msilib.Directory.glob().

* bpo-26013: Added compatibility with broken protocol 2 pickles
  created in old Python 3 versions (3.4.3 and lower).

* bpo-25850: Use cross-compilation by default for 64-bit Windows.

* bpo-17633: Improve zipimport's support for namespace packages.

* bpo-24705: Fix sysconfig._parse_makefile not expanding ${} vars
  appearing before $() vars.

* bpo-22138: Fix mock.patch behavior when patching descriptors.
  Restore original values after patching. Patch contributed by Sean
  McCully.

* bpo-25672: In the ssl module, enable the SSL_MODE_RELEASE_BUFFERS
  mode option if it is safe to do so.

* bpo-26012: Don't traverse into symlinks for "**" pattern in
  pathlib.Path.[r]glob().

* bpo-24120: Ignore PermissionError when traversing a tree with
  pathlib.Path.[r]glob(). Patch by Ulrich Petri.

* bpo-25447: fileinput now uses sys.stdin as-is if it does not have
  a buffer attribute (restores backward compatibility).

* bpo-25447: Copying the lru_cache() wrapper object now always
  works, independedly from the type of the wrapped object (by
  returning the original object unchanged).

* bpo-24103: Fixed possible use after free in
  ElementTree.XMLPullParser.

* bpo-25860: os.fwalk() no longer skips remaining directories when
  error occurs. Original patch by Samson Lee.

* bpo-25914: Fixed and simplified OrderedDict.__sizeof__.

* bpo-25902: Fixed various refcount issues in ElementTree iteration.

* bpo-25717: Restore the previous behaviour of tolerating most
  fstat() errors when opening files.  This was a regression in 3.5a1,
  and stopped anonymous temporary files from working in special cases.

* bpo-24903: Fix regression in number of arguments compileall
  accepts when '-d' is specified.  The check on the number of
  arguments has been dropped completely as it never worked correctly
  anyway.

* bpo-25764: In the subprocess module, preserve any exception caused
  by fork() failure when preexec_fn is used.

* bpo-6478: _strptime's regexp cache now is reset after changing
  timezone with time.tzset().

* bpo-14285: When executing a package with the "python -m package"
  option, and package initialization fails, a proper traceback is now
  reported.  The "runpy" module now lets exceptions from package
  initialization pass back to the caller, rather than raising
  ImportError.

* bpo-19771: Also in runpy and the "-m" option, omit the irrelevant
  message ". . . is a package and cannot be directly executed" if the
  package could not even be initialized (e.g. due to a bad "*.pyc"
  file).

* bpo-25177: Fixed problem with the mean of very small and very
  large numbers. As a side effect, statistics.mean and
  statistics.variance should be significantly faster.

* bpo-25718: Fixed copying object with state with boolean value is
  false.

* bpo-10131: Fixed deep copying of minidom documents.  Based on
  patch by Marian Ganisin.

* bpo-25725: Fixed a reference leak in pickle.loads() when
  unpickling invalid data including tuple instructions.

* bpo-25663: In the Readline completer, avoid listing duplicate
  global names, and search the global namespace before searching
  builtins.

* bpo-25688: Fixed file leak in ElementTree.iterparse() raising an
  error.

* bpo-23914: Fixed SystemError raised by unpickler on broken pickle
  data.

* bpo-25691: Fixed crash on deleting ElementTree.Element attributes.

* bpo-25624: ZipFile now always writes a ZIP_STORED header for
  directory entries.  Patch by Dingyuan Wang.

* Skip getaddrinfo if host is already resolved. Patch by A. Jesse
  Jiryu Davis.

* bpo-26050: Add asyncio.StreamReader.readuntil() method. Patch by
  Марк Коренберг.

* bpo-25924: Avoid unnecessary serialization of getaddrinfo(3) calls
  on OS X versions 10.5 or higher.  Original patch by A. Jesse Jiryu
  Davis.

* bpo-26406: Avoid unnecessary serialization of getaddrinfo(3) calls
  on current versions of OpenBSD and NetBSD.  Patch by A. Jesse Jiryu
  Davis.

* bpo-26848: Fix asyncio/subprocess.communicate() to handle empty
  input. Patch by Jack O'Connor.

* bpo-27040: Add loop.get_exception_handler method

* bpo-27041: asyncio: Add loop.create_future method

* bpo-27223: asyncio: Fix _read_ready and _write_ready to respect
  _conn_lost. Patch by Łukasz Langa.

* bpo-22970: asyncio: Fix inconsistency cancelling Condition.wait.
  Patch by David Coles.


IDLE
----

* bpo-5124: Paste with text selected now replaces the selection on
  X11. This matches how paste works on Windows, Mac, most modern Linux
  apps, and ttk widgets. Original patch by Serhiy Storchaka.

* bpo-24759: Make clear in idlelib.idle_test.__init__ that the
  directory is a private implementation of test.test_idle and tool for
  maintainers.

* bpo-27196: Stop 'ThemeChanged' warnings when running IDLE tests.
  These persisted after other warnings were suppressed in #20567.
  Apply Serhiy Storchaka's update_idletasks solution to four test
  files. Record this additional advice in idle_test/README.txt

* bpo-20567: Revise idle_test/README.txt with advice about avoiding
  tk warning messages from tests.  Apply advice to several IDLE tests.

* bpo-27117: Make colorizer htest and turtledemo work with dark
  themes. Move code for configuring text widget colors to a new
  function.

* bpo-26673: When tk reports font size as 0, change to size 10. Such
  fonts on Linux prevented the configuration dialog from opening.

* bpo-21939: Add test for IDLE's percolator. Original patch by
  Saimadhav Heblikar.

* bpo-21676: Add test for IDLE's replace dialog. Original patch by
  Saimadhav Heblikar.

* bpo-18410: Add test for IDLE's search dialog. Original patch by
  Westley Martínez.

* bpo-21703: Add test for IDLE's undo delegator. Original patch by
  Saimadhav Heblikar .

* bpo-27044: Add ConfigDialog.remove_var_callbacks to stop memory
  leaks.

* bpo-23977: Add more asserts to test_delegator.

* bpo-20640: Add tests for idlelib.configHelpSourceEdit. Patch by
  Saimadhav Heblikar.

* In the 'IDLE-console differences' section of the IDLE doc, clarify
  how running with IDLE affects sys.modules and the standard streams.

* bpo-25507: fix incorrect change in IOBinding that prevented
  printing. Augment IOBinding htest to include all major IOBinding
  functions.

* bpo-25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE
  QUOTATION MARK in README.txt and open this and NEWS.txt with
  'ascii'. Re-encode CREDITS.txt to utf-8 and open it with 'utf-8'.


Documentation
-------------

* bpo-19489: Moved the search box from the sidebar to the header and
  footer of each page. Patch by Ammar Askar.

* bpo-24136: Document the new PEP 448 unpacking syntax of 3.5.

* bpo-26736: Used HTTPS for external links in the documentation if
  possible.

* bpo-6953: Rework the Readline module documentation to group
  related functions together, and add more details such as what
  underlying Readline functions and variables are accessed.

* bpo-23606: Adds note to ctypes documentation regarding
  cdll.msvcrt.

* bpo-25500: Fix documentation to not claim that __import__ is
  searched for in the global scope.

* bpo-26014: Update 3.x packaging documentation: * "See also" links
  to the new docs are now provided in the legacy pages * links to
  setuptools documentation have been updated


Tests
-----

* bpo-21916: Added tests for the turtle module.  Patch by ingrid,
  Gregory Loyse and Jelle Zijlstra.

* bpo-26523: The multiprocessing thread pool
  (multiprocessing.dummy.Pool) was untested.

* bpo-26015: Added new tests for pickling iterators of mutable
  sequences.

* bpo-26325: Added test.support.check_no_resource_warning() to check
  that no ResourceWarning is emitted.

* bpo-25940: Changed test_ssl to use self-signed.pythontest.net.
  This avoids relying on svn.python.org, which recently changed root
  certificate.

* bpo-25616: Tests for OrderedDict are extracted from
  test_collections into separate file test_ordered_dict.

* bpo-26583: Skip test_timestamp_overflow in test_import if bytecode
  files cannot be written.


Build
-----

* bpo-26884: Fix linking extension modules for cross builds. Patch
  by Xavier de Gaye.

* bpo-22359: Disable the rules for running _freeze_importlib and
  pgen when cross- compiling.  The output of these programs is
  normally saved with the source code anyway, and is still regenerated
  when doing a native build. Patch by Xavier de Gaye.

* bpo-27229: Fix the cross-compiling pgen rule for in-tree builds.
  Patch by Xavier de Gaye.

* bpo-21668: Link audioop, _datetime, _ctypes_test modules to libm,
  except on Mac OS X. Patch written by Xavier de Gaye.

* bpo-25702: A --with-lto configure option has been added that will
  enable link time optimizations at build time during a make profile-
  opt. Some compilers and toolchains are known to not produce stable
  code when using LTO, be sure to test things thoroughly before
  relying on it. It can provide a few % speed up over profile-opt
  alone.

* bpo-26624: Adds validation of ucrtbase[d].dll version with warning
  for old versions.

* bpo-17603: Avoid error about nonexistant fileblocks.o file by
  using a lower-level check for st_blocks in struct stat.

* bpo-26079: Fixing the build output folder for tix-8.4.3.6. Patch
  by Bjoern Thiel.

* bpo-26465: Update Windows builds to use OpenSSL 1.0.2g.

* bpo-24421: Compile Modules/_math.c once, before building
  extensions. Previously it could fail to compile properly if the math
  and cmath builds were concurrent.

* bpo-25348: Added "--pgo" and "--pgo-job" arguments to
  "PCbuild\build.bat" for building with Profile-Guided Optimization.
  The old "PCbuild\build_pgo.bat" script is now deprecated, and simply
  calls "PCbuild\build.bat --pgo %*".

* bpo-25827: Add support for building with ICC to "configure",
  including a new "--with-icc" flag.

* bpo-25696: Fix installation of Python on UNIX with make -j9.

* bpo-26930: Update OS X 10.5+ 32-bit-only installer to build and
  link with OpenSSL 1.0.2h.

* bpo-26268: Update Windows builds to use OpenSSL 1.0.2f.

* bpo-25136: Support Apple Xcode 7's new textual SDK stub libraries.

* bpo-24324: Do not enable unreachable code warnings when using gcc
  as the option does not work correctly in older versions of gcc and
  has been silently removed as of gcc-4.5.


Windows
-------

* bpo-27053: Updates make_zip.py to correctly generate library ZIP
  file.

* bpo-26268: Update the prepare_ssl.py script to handle OpenSSL
  releases that don't include the contents of the include directory
  (that is, 1.0.2e and later).

* bpo-26071: bdist_wininst created binaries fail to start and find
  32bit Python

* bpo-26073: Update the list of magic numbers in launcher

* bpo-26065: Excludes venv from library when generating embeddable
  distro.


Tools/Demos
-----------

* bpo-26799: Fix python-gdb.py: don't get C types once when the
  Python code is loaded, but get C types on demand. The C types can
  change if python-gdb.py is loaded before the Python executable.
  Patch written by Thomas Ilsche.

* bpo-26271: Fix the Freeze tool to properly use flags passed
  through configure. Patch by Daniel Shaulov.

* bpo-26489: Add dictionary unpacking support to
  Tools/parser/unparse.py. Patch by Guo Ci Teo.

* bpo-26316: Fix variable name typo in Argument Clinic.


Windows
-------

* bpo-17500: Remove unused and outdated icons. (See also:
  https://github.com/python/pythondotorg/issues/945)


Python 3.5.1 final
==================

*Release date: 2015-12-06*


Core and Builtins
-----------------

* bpo-25709: Fixed problem with in-place string concatenation and
  utf-8 cache.


Windows
-------

* bpo-25715: Python 3.5.1 installer shows wrong upgrade path and
  incorrect logic for launcher detection.


Python 3.5.1 release candidate 1
================================

*Release date: 2015-11-22*


Core and Builtins
-----------------

* bpo-25630: Fix a possible segfault during argument parsing in
  functions that accept filesystem paths.

* bpo-23564: Fixed a partially broken sanity check in the
  _posixsubprocess internals regarding how fds_to_pass were passed to
  the child.  The bug had no actual impact as subprocess.py already
  avoided it.

* bpo-25388: Fixed tokenizer crash when processing undecodable
  source code with a null byte.

* bpo-25462: The hash of the key now is calculated only once in most
  operations in C implementation of OrderedDict.

* bpo-22995: Default implementation of __reduce__ and __reduce_ex__
  now rejects builtin types with not defined __new__.

* bpo-25555: Fix parser and AST: fill lineno and col_offset of "arg"
  node when compiling AST from Python objects.

* bpo-24802: Avoid buffer overreads when int(), float(), compile(),
  exec() and eval() are passed bytes-like objects.  These objects are
  not necessarily terminated by a null byte, but the functions assumed
  they were.

* bpo-24726: Fixed a crash and leaking NULL in repr() of OrderedDict
  that was mutated by direct calls of dict methods.

* bpo-25449: Iterating OrderedDict with keys with unstable hash now
  raises KeyError in C implementations as well as in Python
  implementation.

* bpo-25395: Fixed crash when highly nested OrderedDict structures
  were garbage collected.

* bpo-25274: sys.setrecursionlimit() now raises a RecursionError if
  the new recursion limit is too low depending at the current
  recursion depth. Modify also the "lower-water mark" formula to make
  it monotonic. This mark is used to decide when the overflowed flag
  of the thread state is reset.

* bpo-24402: Fix input() to prompt to the redirected stdout when
  sys.stdout.fileno() fails.

* bpo-24806: Prevent builtin types that are not allowed to be
  subclassed from being subclassed through multiple inheritance.

* bpo-24848: Fixed a number of bugs in UTF-7 decoding of misformed
  data.

* bpo-25280: Import trace messages emitted in verbose (-v) mode are
  no longer formatted twice.

* bpo-25003: On Solaris 11.3 or newer, os.urandom() now uses the
  getrandom() function instead of the getentropy() function. The
  getentropy() function is blocking to generate very good quality
  entropy, os.urandom() doesn't need such high- quality entropy.

* bpo-25182: The stdprinter (used as sys.stderr before the io module
  is imported at startup) now uses the backslashreplace error handler.

* bpo-25131: Make the line number and column offset of set/dict
  literals and comprehensions correspond to the opening brace.

* bpo-25150: Hide the private _Py_atomic_xxx symbols from the public
  Python.h header to fix a compilation error with OpenMP.
  PyThreadState_GET() becomes an alias to PyThreadState_Get() to avoid
  ABI incompatibilies.


Library
-------

* bpo-25626: Change three zlib functions to accept sizes that fit in
  Py_ssize_t, but internally cap those sizes to UINT_MAX.  This
  resolves a regression in 3.5 where GzipFile.read() failed to read
  chunks larger than 2 or 4 GiB.  The change affects the
  zlib.Decompress.decompress() max_length parameter, the
  zlib.decompress() bufsize parameter, and the zlib.Decompress.flush()
  length parameter.

* bpo-25583: Avoid incorrect errors raised by
  os.makedirs(exist_ok=True) when the OS gives priority to errors such
  as EACCES over EEXIST.

* bpo-25593: Change semantics of EventLoop.stop() in asyncio.

* bpo-6973: When we know a subprocess.Popen process has died, do not
  allow the send_signal(), terminate(), or kill() methods to do
  anything as they could potentially signal a different process.

* bpo-25590: In the Readline completer, only call getattr() once per
  attribute.

* bpo-25498: Fix a crash when garbage-collecting ctypes objects
  created by wrapping a memoryview.  This was a regression made in
  3.5a1.  Based on patch by Eryksun.

* bpo-25584: Added "escape" to the __all__ list in the glob module.

* bpo-25584: Fixed recursive glob() with patterns starting with
  "**".

* bpo-25446: Fix regression in smtplib's AUTH LOGIN support.

* bpo-18010: Fix the pydoc web server's module search function to
  handle exceptions from importing packages.

* bpo-25554: Got rid of circular references in regular expression
  parsing.

* bpo-25510: fileinput.FileInput.readline() now returns b'' instead
  of '' at the end if the FileInput was opened with binary mode. Patch
  by Ryosuke Ito.

* bpo-25503: Fixed inspect.getdoc() for inherited docstrings of
  properties. Original patch by John Mark Vandenberg.

* bpo-25515: Always use os.urandom as a source of randomness in
  uuid.uuid4.

* bpo-21827: Fixed textwrap.dedent() for the case when largest
  common whitespace is a substring of smallest leading whitespace.
  Based on patch by Robert Li.

* bpo-25447: The lru_cache() wrapper objects now can be copied and
  pickled (by returning the original object unchanged).

* bpo-25390: typing: Don't crash on Union[str, Pattern].

* bpo-25441: asyncio: Raise error from drain() when socket is
  closed.

* bpo-25410: Cleaned up and fixed minor bugs in C implementation of
  OrderedDict.

* bpo-25411: Improved Unicode support in SMTPHandler through better
  use of the email package. Thanks to user simon04 for the patch.

* bpo-25407: Remove mentions of the formatter module being removed
  in Python 3.6.

* bpo-25406: Fixed a bug in C implementation of
  OrderedDict.move_to_end() that caused segmentation fault or hang in
  iterating after moving several items to the start of ordered dict.

* bpo-25364: zipfile now works in threads disabled builds.

* bpo-25328: smtpd's SMTPChannel now correctly raises a ValueError
  if both decode_data and enable_SMTPUTF8 are set to true.

* bpo-25316: distutils raises OSError instead of
  DistutilsPlatformError when MSVC is not installed.

* bpo-25380: Fixed protocol for the STACK_GLOBAL opcode in
  pickletools.opcodes.

* bpo-23972: Updates asyncio datagram create method allowing
  reuseport and reuseaddr socket options to be set prior to binding
  the socket. Mirroring the existing asyncio create_server method the
  reuseaddr option for datagram sockets defaults to True if the O/S is
  'posix' (except if the platform is Cygwin). Patch by Chris Laws.

* bpo-25304: Add asyncio.run_coroutine_threadsafe().  This lets you
  submit a coroutine to a loop from another thread, returning a
  concurrent.futures.Future.  By Vincent Michel.

* bpo-25232: Fix CGIRequestHandler to split the query from the URL
  at the first question mark (?) rather than the last. Patch from
  Xiang Zhang.

* bpo-24657: Prevent CGIRequestHandler from collapsing slashes in
  the query part of the URL as if it were a path. Patch from Xiang
  Zhang.

* bpo-24483: C implementation of functools.lru_cache() now
  calculates key's hash only once.

* bpo-22958: Constructor and update method of
  weakref.WeakValueDictionary now accept the self and the dict keyword
  arguments.

* bpo-22609: Constructor of collections.UserDict now accepts the
  self keyword argument.

* bpo-25111: Fixed comparison of traceback.FrameSummary.

* bpo-25262: Added support for BINBYTES8 opcode in Python
  implementation of unpickler. Highest 32 bits of 64-bit size for
  BINUNICODE8 and BINBYTES8 opcodes no longer silently ignored on
  32-bit platforms in C implementation.

* bpo-25034: Fix string.Formatter problem with auto-numbering and
  nested format_specs. Patch by Anthon van der Neut.

* bpo-25233: Rewrite the guts of asyncio.Queue and asyncio.Semaphore
  to be more understandable and correct.

* bpo-25203: Failed readline.set_completer_delims() no longer left
  the module in inconsistent state.

* bpo-23600: Default implementation of tzinfo.fromutc() was
  returning wrong results in some cases.

* bpo-23329: Allow the ssl module to be built with older versions of
  LibreSSL.

* Prevent overflow in _Unpickler_Read.

* bpo-25047: The XML encoding declaration written by Element Tree
  now respects the letter case given by the user. This restores the
  ability to write encoding names in uppercase like "UTF-8", which
  worked in Python 2.

* bpo-25135: Make deque_clear() safer by emptying the deque before
  clearing. This helps avoid possible reentrancy issues.

* bpo-19143: platform module now reads Windows version from
  kernel32.dll to avoid compatibility shims.

* bpo-25092: Fix datetime.strftime() failure when errno was already
  set to EINVAL.

* bpo-23517: Fix rounding in fromtimestamp() and utcfromtimestamp()
  methods of datetime.datetime: microseconds are now rounded to
  nearest with ties going to nearest even integer (ROUND_HALF_EVEN),
  instead of being rounding towards minus infinity (ROUND_FLOOR). It's
  important that these methods use the same rounding mode than
  datetime.timedelta to keep the property: (datetime(1970,1,1) +
  timedelta(seconds=t)) == datetime.utcfromtimestamp(t). It also the
  rounding mode used by round(float) for example.

* bpo-25155: Fix datetime.datetime.now() and
  datetime.datetime.utcnow() on Windows to support date after year
  2038. It was a regression introduced in Python 3.5.0.

* bpo-25108: Omitted internal frames in traceback functions
  print_stack(), format_stack(), and extract_stack() called without
  arguments.

* bpo-25118: Fix a regression of Python 3.5.0 in os.waitpid() on
  Windows.

* bpo-24684: socket.socket.getaddrinfo() now calls
  PyUnicode_AsEncodedString() instead of calling the encode() method
  of the host, to handle correctly custom string with an encode()
  method which doesn't return a byte string. The encoder of the IDNA
  codec is now called directly instead of calling the encode() method
  of the string.

* bpo-25060: Correctly compute stack usage of the BUILD_MAP opcode.

* bpo-24857: Comparing call_args to a long sequence now correctly
  returns a boolean result instead of raising an exception.  Patch by
  A Kaptur.

* bpo-23144: Make sure that HTMLParser.feed() returns all the data,
  even when convert_charrefs is True.

* bpo-24982: shutil.make_archive() with the "zip" format now adds
  entries for directories (including empty directories) in ZIP file.

* bpo-25019: Fixed a crash caused by setting non-string key of expat
  parser. Based on patch by John Leitch.

* bpo-16180: Exit pdb if file has syntax error, instead of trapping
  user in an infinite loop.  Patch by Xavier de Gaye.

* bpo-24891: Fix a race condition at Python startup if the file
  descriptor of stdin (0), stdout (1) or stderr (2) is closed while
  Python is creating sys.stdin, sys.stdout and sys.stderr objects.
  These attributes are now set to None if the creation of the object
  failed, instead of raising an OSError exception. Initial patch
  written by Marco Paolini.

* bpo-24992: Fix error handling and a race condition (related to
  garbage collection) in collections.OrderedDict constructor.

* bpo-24881: Fixed setting binary mode in Python implementation of
  FileIO on Windows and Cygwin.  Patch from Akira Li.

* bpo-25578: Fix (another) memory leak in SSLSocket.getpeercer().

* bpo-25530: Disable the vulnerable SSLv3 protocol by default when
  creating ssl.SSLContext.

* bpo-25569: Fix memory leak in SSLSocket.getpeercert().

* bpo-25471: Sockets returned from accept() shouldn't appear to be
  nonblocking.

* bpo-25319: When threading.Event is reinitialized, the underlying
  condition should use a regular lock rather than a recursive lock.

* bpo-21112: Fix regression in unittest.expectedFailure on
  subclasses. Patch from Berker Peksag.

* bpo-24764: cgi.FieldStorage.read_multi() now ignores the Content-
  Length header in part headers. Patch written by Peter Landry and
  reviewed by Pierre Quentel.

* bpo-24913: Fix overrun error in deque.index(). Found by John
  Leitch and Bryce Darling.

* bpo-24774: Fix docstring in http.server.test. Patch from Chiu-
  Hsiang Hsu.

* bpo-21159: Improve message in
  configparser.InterpolationMissingOptionError. Patch from Łukasz
  Langa.

* bpo-20362: Honour TestCase.longMessage correctly in assertRegex.
  Patch from Ilia Kurenkov.

* bpo-23572: Fixed functools.singledispatch on classes with falsy
  metaclasses.  Patch by Ethan Furman.

* asyncio: ensure_future() now accepts awaitable objects.


IDLE
----

* bpo-15348: Stop the debugger engine (normally in a user process)
  before closing the debugger window (running in the IDLE process).
  This prevents the RuntimeErrors that were being caught and ignored.

* bpo-24455: Prevent IDLE from hanging when a) closing the shell
  while the debugger is active (15347); b) closing the debugger with
  the [X] button (15348); and c) activating the debugger when already
  active (24455). The patch by Mark Roseman does this by making two
  changes. 1. Suspend and resume the gui.interaction method with the
  tcl vwait mechanism intended for this purpose (instead of
  root.mainloop & .quit). 2. In gui.run, allow any existing
  interaction to terminate first.

* Change 'The program' to 'Your program' in an IDLE 'kill program?'
  message to make it clearer that the program referred to is the
  currently running user program, not IDLE itself.

* bpo-24750: Improve the appearance of the IDLE editor window status
  bar. Patch by Mark Roseman.

* bpo-25313: Change the handling of new built-in text color themes
  to better address the compatibility problem introduced by the
  addition of IDLE Dark. Consistently use the revised
  idleConf.CurrentTheme everywhere in idlelib.

* bpo-24782: Extension configuration is now a tab in the IDLE
  Preferences dialog rather than a separate dialog.  The former tabs
  are now a sorted list.  Patch by Mark Roseman.

* bpo-22726: Re-activate the config dialog help button with some
  content about the other buttons and the new IDLE Dark theme.

* bpo-24820: IDLE now has an 'IDLE Dark' built-in text color theme.
  It is more or less IDLE Classic inverted, with a cobalt blue
  background. Strings, comments, keywords, ... are still green, red,
  orange, ... . To use it with IDLEs released before November 2015,
  hit the 'Save as New Custom Theme' button and enter a new name, such
  as 'Custom Dark'.  The custom theme will work with any IDLE release,
  and can be modified.

* bpo-25224: README.txt is now an idlelib index for IDLE developers
  and curious users. The previous user content is now in the IDLE doc
  chapter. 'IDLE' now means 'Integrated Development and Learning
  Environment'.

* bpo-24820: Users can now set breakpoint colors in Settings ->
  Custom Highlighting. Original patch by Mark Roseman.

* bpo-24972: Inactive selection background now matches active
  selection background, as configured by users, on all systems.  Found
  items are now always highlighted on Windows.  Initial patch by Mark
  Roseman.

* bpo-24570: Idle: make calltip and completion boxes appear on Macs
  affected by a tk regression.  Initial patch by Mark Roseman.

* bpo-24988: Idle ScrolledList context menus (used in debugger) now
  work on Mac Aqua. Patch by Mark Roseman.

* bpo-24801: Make right-click for context menu work on Mac Aqua.
  Patch by Mark Roseman.

* bpo-25173: Associate tkinter messageboxes with a specific widget.
  For Mac OSX, make them a 'sheet'.  Patch by Mark Roseman.

* bpo-25198: Enhance the initial html viewer now used for Idle Help.
  * Properly indent fixed-pitch text (patch by Mark Roseman). * Give
  code snippet a very Sphinx- like light blueish-gray background. *
  Re-use initial width and height set by users for shell and editor. *
  When the Table of Contents (TOC) menu is used, put the section
  header at the top of the screen.

* bpo-25225: Condense and rewrite Idle doc section on text colors.

* bpo-21995: Explain some differences between IDLE and console
  Python.

* bpo-22820: Explain need for *print* when running file from Idle
  editor.

* bpo-25224: Doc: augment Idle feature list and no-subprocess
  section.

* bpo-25219: Update doc for Idle command line options. Some were
  missing and notes were not correct.

* bpo-24861: Most of idlelib is private and subject to change. Use
  idleib.idle.* to start Idle. See idlelib.__init__.__doc__.

* bpo-25199: Idle: add synchronization comments for future
  maintainers.

* bpo-16893: Replace help.txt with help.html for Idle doc display.
  The new idlelib/help.html is rstripped
  Doc/build/html/library/idle.html. It looks better than help.txt and
  will better document Idle as released. The tkinter html viewer that
  works for this file was written by Mark Roseman. The now unused
  EditorWindow.HelpDialog class and helt.txt file are deprecated.

* bpo-24199: Deprecate unused idlelib.idlever with possible removal
  in 3.6.

* bpo-24790: Remove extraneous code (which also create 2 & 3
  conflicts).


Documentation
-------------

* bpo-22558: Add remaining doc links to source code for Python-coded
  modules. Patch by Yoni Lavi.

* bpo-12067: Rewrite Comparisons section in the Expressions chapter
  of the language reference. Some of the details of comparing mixed
  types were incorrect or ambiguous. NotImplemented is only relevant
  at a lower level than the Expressions chapter. Added details of
  comparing range() objects, and default behaviour and consistency
  suggestions for user-defined classes. Patch from Andy Maier.

* bpo-24952: Clarify the default size argument of stack_size() in
  the "threading" and "_thread" modules. Patch from Mattip.

* bpo-23725: Overhaul tempfile docs. Note deprecated status of
  mktemp. Patch from Zbigniew Jędrzejewski-Szmek.

* bpo-24808: Update the types of some PyTypeObject fields.  Patch by
  Joseph Weston.

* bpo-22812: Fix unittest discovery examples. Patch from Pam
  McA'Nulty.


Tests
-----

* bpo-25449: Added tests for OrderedDict subclasses.

* bpo-25099: Make test_compileall not fail when an entry on sys.path
  cannot be written to (commonly seen in administrative installs on
  Windows).

* bpo-23919: Prevents assert dialogs appearing in the test suite.

* "PCbuild\rt.bat" now accepts an unlimited number of arguments to
  pass along to regrtest.py.  Previously there was a limit of 9.


Build
-----

* bpo-24915: Add LLVM support for PGO builds and use the test suite
  to generate the profile data. Initial patch by Alecsandru Patrascu
  of Intel.

* bpo-24910: Windows MSIs now have unique display names.

* bpo-24986: It is now possible to build Python on Windows without
  errors when external libraries are not available.


Windows
-------

* bpo-25450: Updates shortcuts to start Python in installation
  directory.

* bpo-25164: Changes default all-users install directory to match
  per- user directory.

* bpo-25143: Improves installer error messages for unsupported
  platforms.

* bpo-25163: Display correct directory in installer when using non-
  default settings.

* bpo-25361: Disables use of SSE2 instructions in Windows 32-bit
  build

* bpo-25089: Adds logging to installer for case where launcher is
  not selected on upgrade.

* bpo-25165: Windows uninstallation should not remove launcher if
  other versions remain

* bpo-25112: py.exe launcher is missing icons

* bpo-25102: Windows installer does not precompile for -O or -OO.

* bpo-25081: Makes Back button in installer go back to upgrade page
  when upgrading.

* bpo-25091: Increases font size of the installer.

* bpo-25126: Clarifies that the non-web installer will download some
  components.

* bpo-25213: Restores requestedExecutionLevel to manifest to disable
  UAC virtualization.

* bpo-25022: Removed very outdated PC/example_nt/ directory.


Tools/Demos
-----------

* bpo-25440: Fix output of python-config --extension-suffix.


Python 3.5.0 final
==================

*Release date: 2015-09-13*


Build
-----

* bpo-25071: Windows installer should not require TargetDir
  parameter when installing quietly.


Python 3.5.0 release candidate 4
================================

*Release date: 2015-09-09*


Library
-------

* bpo-25029: Fixes MemoryError in test_strptime.


Build
-----

* bpo-25027: Reverts partial-static build options and adds
  vcruntime140.dll to Windows installation.


Python 3.5.0 release candidate 3
================================

*Release date: 2015-09-07*


Core and Builtins
-----------------

* bpo-24305: Prevent import subsystem stack frames from being
  counted by the warnings.warn(stacklevel=) parameter.

* bpo-24912: Prevent __class__ assignment to immutable built-in
  objects.

* bpo-24975: Fix AST compilation for PEP 448 syntax.


Library
-------

* bpo-24917: time_strftime() buffer over-read.

* bpo-24748: To resolve a compatibility problem found with py2exe
  and pywin32, imp.load_dynamic() once again ignores previously loaded
  modules to support Python modules replacing themselves with
  extension modules. Patch by Petr Viktorin.

* bpo-24635: Fixed a bug in typing.py where isinstance([],
  typing.Iterable) would return True once, then False on subsequent
  calls.

* bpo-24989: Fixed buffer overread in BytesIO.readline() if a
  position is set beyond size.  Based on patch by John Leitch.

* bpo-24913: Fix overrun error in deque.index(). Found by John
  Leitch and Bryce Darling.


Python 3.5.0 release candidate 2
================================

*Release date: 2015-08-25*


Core and Builtins
-----------------

* bpo-24769: Interpreter now starts properly when dynamic loading is
  disabled.  Patch by Petr Viktorin.

* bpo-21167: NAN operations are now handled correctly when python is
  compiled with ICC even if -fp-model strict is not specified.

* bpo-24492: A "package" lacking a __name__ attribute when trying to
  perform a "from .. import ..." statement will trigger an ImportError
  instead of an AttributeError.


Library
-------

* bpo-24847: Removes vcruntime140.dll dependency from Tcl/Tk.

* bpo-24839: platform._syscmd_ver raises DeprecationWarning

* bpo-24867: Fix Task.get_stack() for 'async def' coroutines


Python 3.5.0 release candidate 1
================================

*Release date: 2015-08-09*


Core and Builtins
-----------------

* bpo-24667: Resize odict in all cases that the underlying dict
  resizes.


Library
-------

* bpo-24824: Signatures of codecs.encode() and codecs.decode() now
  are compatible with pydoc.

* bpo-24634: Importing uuid should not try to load libc on Windows

* bpo-24798: _msvccompiler.py doesn't properly support manifests

* bpo-4395: Better testing and documentation of binary operators.
  Patch by Martin Panter.

* bpo-23973: Update typing.py from GitHub repo.

* bpo-23004: mock_open() now reads binary data correctly when the
  type of read_data is bytes.  Initial patch by Aaron Hill.

* bpo-23888: Handle fractional time in cookie expiry. Patch by ssh.

* bpo-23652: Make it possible to compile the select module against
  the libc headers from the Linux Standard Base, which do not include
  some EPOLL macros.  Patch by Matt Frank.

* bpo-22932: Fix timezones in email.utils.formatdate. Patch from
  Dmitry Shachnev.

* bpo-23779: imaplib raises TypeError if authenticator tries to
  abort. Patch from Craig Holmquist.

* bpo-23319: Fix ctypes.BigEndianStructure, swap correctly bytes.
  Patch written by Matthieu Gautier.

* bpo-23254: Document how to close the TCPServer listening socket.
  Patch from Martin Panter.

* bpo-19450: Update Windows and OS X installer builds to use SQLite
  3.8.11.

* bpo-17527: Add PATCH to wsgiref.validator. Patch from Luca
  Sbardella.

* bpo-24791: Fix grammar regression for call syntax: 'g(*a or b)'.


IDLE
----

* bpo-23672: Allow Idle to edit and run files with astral chars in
  name. Patch by Mohd Sanad Zaki Rizvi.

* bpo-24745: Idle editor default font. Switch from Courier to
  platform-sensitive TkFixedFont.  This should not affect current
  customized font selections.  If there is a problem, edit
  $HOME/.idlerc/config-main.cfg and remove 'fontxxx' entries from
  [Editor Window].  Patch by Mark Roseman.

* bpo-21192: Idle editor. When a file is run, put its name in the
  restart bar. Do not print false prompts. Original patch by Adnan
  Umer.

* bpo-13884: Idle menus. Remove tearoff lines. Patch by Roger Serwy.


Documentation
-------------

* bpo-24129: Clarify the reference documentation for name
  resolution. This includes removing the assumption that readers will
  be familiar with the name resolution scheme Python used prior to the
  introduction of lexical scoping for function namespaces. Patch by
  Ivan Levkivskyi.

* bpo-20769: Improve reload() docs. Patch by Dorian Pula.

* bpo-23589: Remove duplicate sentence from the FAQ.  Patch by
  Yongzhi Pan.

* bpo-24729: Correct IO tutorial to match implementation regarding
  encoding parameter to open function.


Tests
-----

* bpo-24751: When running regrtest with the "-w" command line
  option, a test run is no longer marked as a failure if all tests
  succeed when re-run.


Python 3.5.0 beta 4
===================

*Release date: 2015-07-26*


Core and Builtins
-----------------

* bpo-23573: Restored optimization of bytes.rfind() and
  bytearray.rfind() for single-byte argument on Linux.

* bpo-24569: Make PEP 448 dictionary evaluation more consistent.

* bpo-24583: Fix crash when set is mutated while being updated.

* bpo-24407: Fix crash when dict is mutated while being updated.

* bpo-24619: New approach for tokenizing async/await. As a
  consequence, it is now possible to have one-line 'async def foo():
  await ..' functions.

* bpo-24687: Plug refleak on SyntaxError in function parameters
  annotations.

* bpo-15944: memoryview: Allow arbitrary formats when casting to
  bytes. Patch by Martin Panter.


Library
-------

* bpo-23441: rcompleter now prints a tab character instead of
  displaying possible completions for an empty word.  Initial patch by
  Martin Sekera.

* bpo-24683: Fixed crashes in _json functions called with arguments
  of inappropriate type.

* bpo-21697: shutil.copytree() now correctly handles symbolic links
  that point to directories.  Patch by Eduardo Seabra and Thomas
  Kluyver.

* bpo-14373: Fixed segmentation fault when gc.collect() is called
  during constructing lru_cache (C implementation).

* bpo-24695: Fix a regression in traceback.print_exception().  If
  exc_traceback is None we shouldn't print a traceback header like
  described in the documentation.

* bpo-24620: Random.setstate() now validates the value of state last
  element.

* bpo-22485: Fixed an issue that caused "inspect.getsource" to
  return incorrect results on nested functions.

* bpo-22153: Improve unittest docs. Patch from Martin Panter and
  evilzero.

* bpo-24580: Symbolic group references to open group in re patterns
  now are explicitly forbidden as well as numeric group references.

* bpo-24206: Fixed __eq__ and __ne__ methods of inspect classes.

* bpo-24631: Fixed regression in the timeit module with multiline
  setup.

* bpo-18622: unittest.mock.mock_open().reset_mock would recurse
  infinitely. Patch from Nicola Palumbo and Laurent De Buyst.

* bpo-23661: unittest.mock side_effects can now be exceptions again.
  This was a regression vs Python 3.4. Patch from Ignacio Rossi

* bpo-24608: chunk.Chunk.read() now always returns bytes, not str.

* bpo-18684: Fixed reading out of the buffer in the re module.

* bpo-24259: tarfile now raises a ReadError if an archive is
  truncated inside a data segment.

* bpo-15014: SMTP.auth() and SMTP.login() now support RFC 4954's
  optional initial- response argument to the SMTP AUTH command.

* bpo-24669: Fix inspect.getsource() for 'async def' functions.
  Patch by Kai Groner.

* bpo-24688: ast.get_docstring() for 'async def' functions.


Build
-----

* bpo-24603: Update Windows builds and OS X 10.5 installer to use
  OpenSSL 1.0.2d.


Python 3.5.0 beta 3
===================

*Release date: 2015-07-05*


Core and Builtins
-----------------

* bpo-24467: Fixed possible buffer over-read in bytearray. The
  bytearray object now always allocates place for trailing null byte
  and it's buffer now is always null-terminated.

* Upgrade to Unicode 8.0.0.

* bpo-24345: Add Py_tp_finalize slot for the stable ABI.

* bpo-24400: Introduce a distinct type for PEP 492 coroutines; add
  types.CoroutineType, inspect.getcoroutinestate,
  inspect.getcoroutinelocals; coroutines no longer use CO_GENERATOR
  flag; sys.set_coroutine_wrapper works only for 'async def'
  coroutines; inspect.iscoroutine no longer uses
  collections.abc.Coroutine, it's intended to test for pure 'async
  def' coroutines only; add new opcode: GET_YIELD_FROM_ITER; fix
  generators wrapper used in types.coroutine to be instance of
  collections.abc.Generator; collections.abc.Awaitable and
  collections.abc.Coroutine can no longer be used to detect generator-
  based coroutines--use inspect.isawaitable instead.

* bpo-24450: Add gi_yieldfrom to generators and cr_await to
  coroutines. Contributed by Benno Leslie and Yury Selivanov.

* bpo-19235: Add new RecursionError exception. Patch by Georg
  Brandl.


Library
-------

* bpo-21750: mock_open.read_data can now be read from each instance,
  as it could in Python 3.3.

* bpo-24552: Fix use after free in an error case of the _pickle
  module.

* bpo-24514: tarfile now tolerates number fields consisting of only
  whitespace.

* bpo-19176: Fixed doctype() related bugs in C implementation of
  ElementTree. A deprecation warning no longer issued by XMLParser
  subclass with default doctype() method.  Direct call of doctype()
  now issues a warning.  Parser's doctype() now is not called if
  target's doctype() is called.  Based on patch by Martin Panter.

* bpo-20387: Restore semantic round-trip correctness in
  tokenize/untokenize for tab- indented blocks.

* bpo-24456: Fixed possible buffer over-read in adpcm2lin() and
  lin2adpcm() functions of the audioop module.

* bpo-24336: The contextmanager decorator now works with functions
  with keyword arguments called "func" and "self".  Patch by Martin
  Panter.

* bpo-24522: Fix possible integer overflow in json accelerator
  module.

* bpo-24489: ensure a previously set C errno doesn't disturb
  cmath.polar().

* bpo-24408: Fixed AttributeError in measure() and metrics() methods
  of tkinter.Font.

* bpo-14373: C implementation of functools.lru_cache() now can be
  used with methods.

* bpo-24347: Set KeyError if PyDict_GetItemWithError returns NULL.

* bpo-24348: Drop superfluous incref/decref.

* bpo-24359: Check for changed OrderedDict size during iteration.

* bpo-24368: Support keyword arguments in OrderedDict methods.

* bpo-24362: Simplify the C OrderedDict fast nodes resize logic.

* bpo-24377: Fix a ref leak in OrderedDict.__repr__.

* bpo-24369: Defend against key-changes during iteration.


Tests
-----

* bpo-24373: _testmultiphase and xxlimited now use tp_traverse and
  tp_finalize to avoid reference leaks encountered when combining
  tp_dealloc with PyType_FromSpec (see bpo-16690 for details)


Documentation
-------------

* bpo-24458: Update documentation to cover multi-phase
  initialization for extension modules (PEP 489). Patch by Petr
  Viktorin.

* bpo-24351: Clarify what is meant by "identifier" in the context of
  string.Template instances.


Build
-----

* bpo-24432: Update Windows builds and OS X 10.5 installer to use
  OpenSSL 1.0.2c.


Python 3.5.0 beta 2
===================

*Release date: 2015-05-31*


Core and Builtins
-----------------

* bpo-24284: The startswith and endswith methods of the str class no
  longer return True when finding the empty string and the indexes are
  completely out of range.

* bpo-24115: Update uses of PyObject_IsTrue(), PyObject_Not(),
  PyObject_IsInstance(), PyObject_RichCompareBool() and
  _PyDict_Contains() to check for and handle errors correctly.

* bpo-24328: Fix importing one character extension modules.

* bpo-11205: In dictionary displays, evaluate the key before the
  value.

* bpo-24285: Fixed regression that prevented importing extension
  modules from inside packages. Patch by Petr Viktorin.


Library
-------

* bpo-23247: Fix a crash in the StreamWriter.reset() of CJK codecs.

* bpo-24270: Add math.isclose() and cmath.isclose() functions as per
  PEP 485. Contributed by Chris Barker and Tal Einat.

* bpo-5633: Fixed timeit when the statement is a string and the
  setup is not.

* bpo-24326: Fixed audioop.ratecv() with non-default weightB
  argument. Original patch by David Moore.

* bpo-16991: Add a C implementation of OrderedDict.

* bpo-23934: Fix inspect.signature to fail correctly for builtin
  types lacking signature information.  Initial patch by James Powell.


Python 3.5.0 beta 1
===================

*Release date: 2015-05-24*


Core and Builtins
-----------------

* bpo-24276: Fixed optimization of property descriptor getter.

* bpo-24268: PEP 489: Multi-phase extension module initialization.
  Patch by Petr Viktorin.

* bpo-23955: Add pyvenv.cfg option to suppress registry/environment
  lookup for generating sys.path on Windows.

* bpo-24257: Fixed system error in the comparison of faked
  types.SimpleNamespace.

* bpo-22939: Fixed integer overflow in iterator object.  Patch by
  Clement Rouault.

* bpo-23985: Fix a possible buffer overrun when deleting a slice
  from the front of a bytearray and then appending some other bytes
  data.

* bpo-24102: Fixed exception type checking in standard error
  handlers.

* bpo-15027: The UTF-32 encoder is now 3x to 7x faster.

* bpo-23290: Optimize set_merge() for cases where the target is
  empty. (Contributed by Serhiy Storchaka.)

* bpo-2292: PEP 448: Additional Unpacking Generalizations.

* bpo-24096: Make warnings.warn_explicit more robust against
  mutation of the warnings.filters list.

* bpo-23996: Avoid a crash when a delegated generator raises an
  unnormalized StopIteration exception.  Patch by Stefan Behnel.

* bpo-23910: Optimize property() getter calls.  Patch by Joe Jevnik.

* bpo-23911: Move path-based importlib bootstrap code to a separate
  frozen module.

* bpo-24192: Fix namespace package imports.

* bpo-24022: Fix tokenizer crash when processing undecodable source
  code.

* bpo-9951: Added a hex() method to bytes, bytearray, and
  memoryview.

* bpo-22906: PEP 479: Change StopIteration handling inside
  generators.

* bpo-24017: PEP 492: Coroutines with async and await syntax.


Library
-------

* bpo-14373: Added C implementation of functools.lru_cache().  Based
  on patches by Matt Joiner and Alexey Kachayev.

* bpo-24230: The tempfile module now accepts bytes for prefix,
  suffix and dir parameters and returns bytes in such situations
  (matching the os module APIs).

* bpo-22189: collections.UserString now supports __getnewargs__(),
  __rmod__(), casefold(), format_map(), isprintable(), and
  maketrans(). Patch by Joe Jevnik.

* bpo-24244: Prevents termination when an invalid format string is
  encountered on Windows in strftime.

* bpo-23973: PEP 484: Add the typing module.

* bpo-23086: The collections.abc.Sequence() abstract base class
  added *start* and *stop* parameters to the index() mixin. Patch by
  Devin Jeanpierre.

* bpo-20035: Replaced the "tkinter._fix" module used for setting up
  the Tcl/Tk environment on Windows with a private function in the
  "_tkinter" module that makes no permanent changes to the
  environment.

* bpo-24257: Fixed segmentation fault in sqlite3.Row constructor
  with faked cursor type.

* bpo-15836: assertRaises(), assertRaisesRegex(), assertWarns() and
  assertWarnsRegex() assertments now check the type of the first
  argument to prevent possible user error.  Based on patch by Daniel
  Wagner-Hall.

* bpo-9858: Add missing method stubs to _io.RawIOBase.  Patch by
  Laura Rupprecht.

* bpo-22955: attrgetter, itemgetter and methodcaller objects in the
  operator module now support pickling.  Added readable and evaluable
  repr for these objects. Based on patch by Josh Rosenberg.

* bpo-22107: tempfile.gettempdir() and tempfile.mkdtemp() now try
  again when a directory with the chosen name already exists on
  Windows as well as on Unix. tempfile.mkstemp() now fails early if
  parent directory is not valid (not exists or is a file) on Windows.

* bpo-23780: Improved error message in os.path.join() with single
  argument.

* bpo-6598: Increased time precision and random number range in
  email.utils.make_msgid() to strengthen the uniqueness of the message
  ID.

* bpo-24091: Fixed various crashes in corner cases in C
  implementation of ElementTree.

* bpo-21931: msilib.FCICreate() now raises TypeError in the case of
  a bad argument instead of a ValueError with a bogus FCI error
  number. Patch by Jeffrey Armstrong.

* bpo-13866: *quote_via* argument added to urllib.parse.urlencode.

* bpo-20098: New mangle_from policy option for email, default True
  for compat32, but False for all other policies.

* bpo-24211: The email library now supports RFC 6532: it can
  generate headers using utf-8 instead of encoded words.

* bpo-16314: Added support for the LZMA compression in distutils.

* bpo-21804: poplib now supports RFC 6856 (UTF8).

* bpo-18682: Optimized pprint functions for builtin scalar types.

* bpo-22027: smtplib now supports RFC 6531 (SMTPUTF8).

* bpo-23488: Random generator objects now consume 2x less memory on
  64-bit.

* bpo-1322: platform.dist() and platform.linux_distribution()
  functions are now deprecated.  Initial patch by Vajrasky Kok.

* bpo-22486: Added the math.gcd() function.  The fractions.gcd()
  function now is deprecated.  Based on patch by Mark Dickinson.

* bpo-24064: Property() docstrings are now writeable. (Patch by
  Berker Peksag.)

* bpo-22681: Added support for the koi8_t encoding.

* bpo-22682: Added support for the kz1048 encoding.

* bpo-23796: peek and read1 methods of BufferedReader now raise
  ValueError if they called on a closed object. Patch by John
  Hergenroeder.

* bpo-21795: smtpd now supports the 8BITMIME extension whenever the
  new *decode_data* constructor argument is set to False.

* bpo-24155: optimize heapq.heapify() for better cache performance
  when heapifying large lists.

* bpo-21800: imaplib now supports RFC 5161 (enable), RFC 6855
  (utf8/internationalized email) and automatically encodes non-ASCII
  usernames and passwords to UTF8.

* bpo-20274: When calling a _sqlite.Connection, it now complains if
  passed any keyword arguments.  Previously it silently ignored them.

* bpo-20274: Remove ignored and erroneous "kwargs" parameters from
  three METH_VARARGS methods on _sqlite.Connection.

* bpo-24134: assertRaises(), assertRaisesRegex(), assertWarns() and
  assertWarnsRegex() checks now emits a deprecation warning when
  callable is None or keyword arguments except msg is passed in the
  context manager mode.

* bpo-24018: Add a collections.abc.Generator abstract base class.
  Contributed by Stefan Behnel.

* bpo-23880: Tkinter's getint() and getdouble() now support Tcl_Obj.
  Tkinter's getdouble() now supports any numbers (in particular int).

* bpo-22619: Added negative limit support in the traceback module.
  Based on patch by Dmitry Kazakov.

* bpo-24094: Fix possible crash in json.encode with poorly behaved
  dict subclasses.

* bpo-9246: On POSIX, os.getcwd() now supports paths longer than
  1025 bytes. Patch written by William Orr.

* bpo-17445: add difflib.diff_bytes() to support comparison of byte
  strings (fixes a regression from Python 2).

* bpo-23917: Fall back to sequential compilation when
  ProcessPoolExecutor doesn't exist. Patch by Claudiu Popa.

* bpo-23008: Fixed resolving attributes with boolean value is False
  in pydoc.

* Fix asyncio issue 235: LifoQueue and PriorityQueue's put didn't
  increment unfinished tasks (this bug was introduced when
  JoinableQueue was merged with Queue).

* bpo-23908: os functions now reject paths with embedded null
  character on Windows instead of silently truncating them.

* bpo-23728: binascii.crc_hqx() could return an integer outside of
  the range 0-0xffff for empty data.

* bpo-23887: urllib.error.HTTPError now has a proper repr()
  representation. Patch by Berker Peksag.

* asyncio: New event loop APIs: set_task_factory() and
  get_task_factory().

* asyncio: async() function is deprecated in favour of
  ensure_future().

* bpo-24178: asyncio.Lock, Condition, Semaphore, and
  BoundedSemaphore support new 'async with' syntax.  Contributed by
  Yury Selivanov.

* bpo-24179: Support 'async for' for asyncio.StreamReader.
  Contributed by Yury Selivanov.

* bpo-24184: Add AsyncIterator and AsyncIterable ABCs to
  collections.abc. Contributed by Yury Selivanov.

* bpo-22547: Implement informative __repr__ for
  inspect.BoundArguments. Contributed by Yury Selivanov.

* bpo-24190: Implement inspect.BoundArgument.apply_defaults()
  method. Contributed by Yury Selivanov.

* bpo-20691: Add 'follow_wrapped' argument to
  inspect.Signature.from_callable() and inspect.signature().
  Contributed by Yury Selivanov.

* bpo-24248: Deprecate inspect.Signature.from_function() and
  inspect.Signature.from_builtin().

* bpo-23898: Fix inspect.classify_class_attrs() to support
  attributes with overloaded __eq__ and __bool__.  Patch by Mike
  Bayer.

* bpo-24298: Fix inspect.signature() to correctly unwrap wrappers
  around bound methods.


IDLE
----

* bpo-23184: remove unused names and imports in idlelib. Initial
  patch by Al Sweigart.


Tests
-----

* bpo-21520: test_zipfile no longer fails if the word 'bad' appears
  anywhere in the name of the current directory.

* bpo-9517: Move script_helper into the support package. Patch by
  Christie Wilson.


Documentation
-------------

* bpo-22155: Add File Handlers subsection with createfilehandler to
  tkinter doc.  Remove obsolete example from FAQ.  Patch by Martin
  Panter.

* bpo-24029: Document the name binding behavior for submodule
  imports.

* bpo-24077: Fix typo in man page for -I command option: -s, not -S


Tools/Demos
-----------

* bpo-24000: Improved Argument Clinic's mapping of converters to
  legacy "format units". Updated the documentation to match.

* bpo-24001: Argument Clinic converters now use accept={type}
  instead of types={'type'} to specify the types the converter
  accepts.

* bpo-23330: h2py now supports arbitrary filenames in #include.

* bpo-24031: make patchcheck now supports git checkouts, too.


Python 3.5.0 alpha 4
====================

*Release date: 2015-04-19*


Core and Builtins
-----------------

* bpo-22980: Under Linux, GNU/KFreeBSD and the Hurd, C extensions
  now include the architecture triplet in the extension name, to make
  it easy to test builds for different ABIs in the same working tree.
  Under OS X, the extension name now includes PEP 3149-style
  information.

* bpo-22631: Added Linux-specific socket constant CAN_RAW_FD_FRAMES.
  Patch courtesy of Joe Jevnik.

* bpo-23731: Implement PEP 488: removal of .pyo files.

* bpo-23726: Don't enable GC for user subclasses of non-GC types
  that don't add any new fields.  Patch by Eugene Toder.

* bpo-23309: Avoid a deadlock at shutdown if a daemon thread is
  aborted while it is holding a lock to a buffered I/O object, and the
  main thread tries to use the same I/O object (typically stdout or
  stderr).  A fatal error is emitted instead.

* bpo-22977: Fixed formatting Windows error messages on Wine. Patch
  by Martin Panter.

* bpo-23466: %c, %o, %x, and %X in bytes formatting now raise
  TypeError on non-integer input.

* bpo-24044: Fix possible null pointer dereference in list.sort in
  out of memory conditions.

* bpo-21354: PyCFunction_New function is exposed by python DLL
  again.


Library
-------

* bpo-23840: tokenize.open() now closes the temporary binary file on
  error to fix a resource warning.

* bpo-16914: new debuglevel 2 in smtplib adds timestamps to debug
  output.

* bpo-7159: urllib.request now supports sending auth credentials
  automatically after the first 401.  This enhancement is a superset
  of the enhancement from bpo-19494 and supersedes that change.

* bpo-23703: Fix a regression in urljoin() introduced in
  901e4e52b20a. Patch by Demian Brecht.

* bpo-4254: Adds _curses.update_lines_cols().  Patch by Arnon Yaari

* bpo-19933: Provide default argument for ndigits in round. Patch by
  Vajrasky Kok.

* bpo-23193: Add a numeric_owner parameter to
  tarfile.TarFile.extract and tarfile.TarFile.extractall. Patch by
  Michael Vogt and Eric Smith.

* bpo-23342: Add a subprocess.run() function than returns a
  CalledProcess instance for a more consistent API than the existing
  call* functions.

* bpo-21217: inspect.getsourcelines() now tries to compute the start
  and end lines from the code object, fixing an issue when a lambda
  function is used as decorator argument. Patch by Thomas Ballinger
  and Allison Kaptur.

* bpo-24521: Fix possible integer overflows in the pickle module.

* bpo-22931: Allow '[' and ']' in cookie values.

* The keywords attribute of functools.partial is now always a
  dictionary.

* bpo-23811: Add missing newline to the PyCompileError error
  message. Patch by Alex Shkop.

* bpo-21116: Avoid blowing memory when allocating a multiprocessing
  shared array that's larger than 50% of the available RAM.  Patch by
  Médéric Boquien.

* bpo-22982: Improve BOM handling when seeking to multiple positions
  of a writable text file.

* bpo-23464: Removed deprecated asyncio JoinableQueue.

* bpo-23529: Limit the size of decompressed data when reading from
  GzipFile, BZ2File or LZMAFile.  This defeats denial of service
  attacks using compressed bombs (i.e. compressed payloads which
  decompress to a huge size).  Patch by Martin Panter and Nikolaus
  Rath.

* bpo-21859: Added Python implementation of io.FileIO.

* bpo-23865: close() methods in multiple modules now are idempotent
  and more robust at shutdown. If they need to release multiple
  resources, all are released even if errors occur.

* bpo-23400: Raise same exception on both Python 2 and 3 if sem_open
  is not available. Patch by Davin Potts.

* bpo-10838: The subprocess now module includes SubprocessError and
  TimeoutError in its list of exported names for the users wild enough
  to use "from subprocess import *".

* bpo-23411: Added DefragResult, ParseResult, SplitResult,
  DefragResultBytes, ParseResultBytes, and SplitResultBytes to
  urllib.parse.__all__. Patch by Martin Panter.

* bpo-23881: urllib.request.ftpwrapper constructor now closes the
  socket if the FTP connection failed to fix a ResourceWarning.

* bpo-23853: "socket.socket.sendall()" does no more reset the socket
  timeout each time data is sent successfully. The socket timeout is
  now the maximum total duration to send all data.

* bpo-22721: An order of multiline pprint output of set or dict
  containing orderable and non-orderable elements no longer depends on
  iteration order of set or dict.

* bpo-15133: _tkinter.tkapp.getboolean() now supports Tcl_Obj and
  always returns bool. tkinter.BooleanVar now validates input values
  (accepted bool, int, str, and Tcl_Obj).  tkinter.BooleanVar.get()
  now always returns bool.

* bpo-10590: xml.sax.parseString() now supports string argument.

* bpo-23338: Fixed formatting ctypes error messages on Cygwin. Patch
  by Makoto Kato.

* bpo-15582: inspect.getdoc() now follows inheritance chains.

* bpo-2175: SAX parsers now support a character stream of
  InputSource object.

* bpo-16840: Tkinter now supports 64-bit integers added in Tcl 8.4
  and arbitrary precision integers added in Tcl 8.5.

* bpo-23834: Fix socket.sendto(), use the C Py_ssize_t type to store
  the result of sendto() instead of the C int type.

* bpo-23618: "socket.socket.connect()" now waits until the
  connection completes instead of raising "InterruptedError" if the
  connection is interrupted by signals, signal handlers don't raise an
  exception and the socket is blocking or has a timeout.
  "socket.socket.connect()" still raise "InterruptedError" for non-
  blocking sockets.

* bpo-21526: Tkinter now supports new boolean type in Tcl 8.5.

* bpo-23836: Fix the faulthandler module to handle reentrant calls
  to its signal handlers.

* bpo-23838: linecache now clears the cache and returns an empty
  result on MemoryError.

* bpo-10395: Added os.path.commonpath(). Implemented in posixpath
  and ntpath. Based on patch by Rafik Draoui.

* bpo-23611: Serializing more "lookupable" objects (such as unbound
  methods or nested classes) now are supported with pickle protocols <
  4.

* bpo-13583: sqlite3.Row now supports slice indexing.

* bpo-18473: Fixed 2to3 and 3to2 compatible pickle mappings.  Fixed
  ambigious reverse mappings.  Added many new mappings.  Import
  mapping is no longer applied to modules already mapped with full
  name mapping.

* bpo-23485: select.select() is now retried automatically with the
  recomputed timeout when interrupted by a signal, except if the
  signal handler raises an exception. This change is part of the PEP
  475.

* bpo-23752: When built from an existing file descriptor,
  io.FileIO() now only calls fstat() once. Before fstat() was called
  twice, which was not necessary.

* bpo-23704: collections.deque() objects now support __add__,
  __mul__, and __imul__().

* bpo-23171: csv.Writer.writerow() now supports arbitrary iterables.

* bpo-23745: The new email header parser now handles duplicate MIME
  parameter names without error, similar to how get_param behaves.

* bpo-22117: Fix os.utime(), it now rounds the timestamp towards
  minus infinity (-inf) instead of rounding towards zero.

* bpo-23310: Fix MagicMock's initializer to work with __methods__,
  just like configure_mock().  Patch by Kasia Jachim.


Build
-----

* bpo-23817: FreeBSD now uses "1.0" in the SOVERSION as other
  operating systems, instead of just "1".

* bpo-23501: Argument Clinic now generates code into separate files
  by default.


Tests
-----

* bpo-23799: Added test.support.start_threads() for running and
  cleaning up multiple threads.

* bpo-22390: test.regrtest now emits a warning if temporary files or
  directories are left after running a test.


Tools/Demos
-----------

* bpo-18128: pygettext now uses standard +NNNN format in the POT-
  Creation-Date header.

* bpo-23935: Argument Clinic's understanding of format units
  accepting bytes, bytearrays, and buffers is now consistent with both
  the documentation and the implementation.

* bpo-23944: Argument Clinic now wraps long impl prototypes at
  column 78.

* bpo-20586: Argument Clinic now ensures that functions without
  docstrings have signatures.

* bpo-23492: Argument Clinic now generates argument parsing code
  with PyArg_Parse instead of PyArg_ParseTuple if possible.

* bpo-23500: Argument Clinic is now smarter about generating the
  "#ifndef" (empty) definition of the methoddef macro: it's only
  generated once, even if Argument Clinic processes the same symbol
  multiple times, and it's emitted at the end of all processing rather
  than immediately after the first use.


C API
-----

* bpo-23998: PyImport_ReInitLock() now checks for lock allocation
  error


Python 3.5.0 alpha 3
====================

*Release date: 2015-03-28*


Core and Builtins
-----------------

* bpo-23573: Increased performance of string search operations
  (str.find, str.index, str.count, the in operator, str.split,
  str.partition) with arguments of different kinds (UCS1, UCS2, UCS4).

* bpo-23753: Python doesn't support anymore platforms without stat()
  or fstat(), these functions are always required.

* bpo-23681: The -b option now affects comparisons of bytes with
  int.

* bpo-23632: Memoryviews now allow tuple indexing (including for
  multi-dimensional memoryviews).

* bpo-23192: Fixed generator lambdas.  Patch by Bruno Cauet.

* bpo-23629: Fix the default __sizeof__ implementation for variable-
  sized objects.


Library
-------

* bpo-14260: The groupindex attribute of regular expression pattern
  object now is non- modifiable mapping.

* bpo-23792: Ignore KeyboardInterrupt when the pydoc pager is
  active. This mimics the behavior of the standard unix pagers, and
  prevents pipepager from shutting down while the pager itself is
  still running.

* bpo-23775: pprint() of OrderedDict now outputs the same
  representation as repr().

* bpo-23765: Removed IsBadStringPtr calls in ctypes

* bpo-22364: Improved some re error messages using regex for hints.

* bpo-23742: ntpath.expandvars() no longer loses unbalanced single
  quotes.

* bpo-21717: The zipfile.ZipFile.open function now supports 'x'
  (exclusive creation) mode.

* bpo-21802: The reader in BufferedRWPair now is closed even when
  closing writer failed in BufferedRWPair.close().

* bpo-23622: Unknown escapes in regular expressions that consist of
  "'\'" and ASCII letter now raise a deprecation warning and will be
  forbidden in Python 3.6.

* bpo-23671: string.Template now allows specifying the "self"
  parameter as a keyword argument.  string.Formatter now allows
  specifying the "self" and the "format_string" parameters as keyword
  arguments.

* bpo-23502: The pprint module now supports mapping proxies.

* bpo-17530: pprint now wraps long bytes objects and bytearrays.

* bpo-22687: Fixed some corner cases in breaking words in tetxtwrap.
  Got rid of quadratic complexity in breaking long words.

* bpo-4727: The copy module now uses pickle protocol 4 (PEP 3154)
  and supports copying of instances of classes whose __new__ method
  takes keyword-only arguments.

* bpo-23491: Added a zipapp module to support creating executable
  zip file archives of Python code. Registered ".pyz" and ".pyzw"
  extensions on Windows for these archives (PEP 441).

* bpo-23657: Avoid explicit checks for str in zipapp, adding support
  for pathlib.Path objects as arguments.

* bpo-23688: Added support of arbitrary bytes-like objects and
  avoided unnecessary copying of memoryview in gzip.GzipFile.write().
  Original patch by Wolfgang Maier.

* bpo-23252: Added support for writing ZIP files to unseekable
  streams.

* bpo-23647: Increase impalib's MAXLINE to accommodate modern
  mailbox sizes.

* bpo-23539: If body is None, http.client.HTTPConnection.request now
  sets Content-Length to 0 for PUT, POST, and PATCH headers to avoid
  411 errors from some web servers.

* bpo-22351: The nntplib.NNTP constructor no longer leaves the
  connection and socket open until the garbage collector cleans them
  up.  Patch by Martin Panter.

* bpo-23704: collections.deque() objects now support methods for
  index(), insert(), and copy().  This allows deques to be registered
  as a MutableSequence and it improves their substitutability for
  lists.

* bpo-23715: "signal.sigwaitinfo()" and "signal.sigtimedwait()" are
  now retried when interrupted by a signal not in the *sigset*
  parameter, if the signal handler does not raise an exception.
  signal.sigtimedwait() recomputes the timeout with a monotonic clock
  when it is retried.

* bpo-23001: Few functions in modules mmap, ossaudiodev, socket,
  ssl, and codecs, that accepted only read-only bytes-like object now
  accept writable bytes-like object too.

* bpo-23646: If time.sleep() is interrupted by a signal, the sleep
  is now retried with the recomputed delay, except if the signal
  handler raises an exception (PEP 475).

* bpo-23136: _strptime now uniformly handles all days in week 0,
  including Dec 30 of previous year.  Based on patch by Jim Carroll.

* bpo-23700: Iterator of NamedTemporaryFile now keeps a reference to
  NamedTemporaryFile instance.  Patch by Bohuslav Kabrda.

* bpo-22903: The fake test case created by unittest.loader when it
  fails importing a test module is now picklable.

* bpo-22181: On Linux, os.urandom() now uses the new getrandom()
  syscall if available, syscall introduced in the Linux kernel 3.17.
  It is more reliable and more secure, because it avoids the need of a
  file descriptor and waits until the kernel has enough entropy.

* bpo-2211: Updated the implementation of the http.cookies.Morsel
  class. Setting attributes key, value and coded_value directly now is
  deprecated. update() and setdefault() now transform and check keys.
  Comparing for equality now takes into account attributes key, value
  and coded_value. copy() now returns a Morsel, not a dict.  repr()
  now contains all attributes. Optimized checking keys and quoting
  values.  Added new tests. Original patch by Demian Brecht.

* bpo-18983: Allow selection of output units in timeit. Patch by
  Julian Gindi.

* bpo-23631: Fix traceback.format_list when a traceback has been
  mutated.

* bpo-23568: Add rdivmod support to MagicMock() objects. Patch by
  Håkan Lövdahl.

* bpo-2052: Add charset parameter to HtmlDiff.make_file().

* bpo-23668: Support os.truncate and os.ftruncate on Windows.

* bpo-23138: Fixed parsing cookies with absent keys or values in
  cookiejar. Patch by Demian Brecht.

* bpo-23051: multiprocessing.Pool methods imap() and
  imap_unordered() now handle exceptions raised by an iterator.  Patch
  by Alon Diamant and Davin Potts.

* bpo-23581: Add matmul support to MagicMock. Patch by Håkan
  Lövdahl.

* bpo-23566: enable(), register(), dump_traceback() and
  dump_traceback_later() functions of faulthandler now accept file
  descriptors. Patch by Wei Wu.

* bpo-22928: Disabled HTTP header injections in http.client.
  Original patch by Demian Brecht.

* bpo-23615: Modules bz2, tarfile and tokenize now can be reloaded
  with imp.reload(). Patch by Thomas Kluyver.

* bpo-23605: os.walk() now calls os.scandir() instead of
  os.listdir(). The usage of os.scandir() reduces the number of calls
  to os.stat(). Initial patch written by Ben Hoyt.


Build
-----

* bpo-23585: make patchcheck will ensure the interpreter is built.


Tests
-----

* bpo-23583: Added tests for standard IO streams in IDLE.

* bpo-22289: Prevent test_urllib2net failures due to ftp connection
  timeout.


Tools/Demos
-----------

* bpo-22826: The result of open() in Tools/freeze/bkfile.py is now
  better compatible with regular files (in particular it now supports
  the context management protocol).


Python 3.5.0 alpha 2
====================

*Release date: 2015-03-09*


Core and Builtins
-----------------

* bpo-23571: PyObject_Call() and PyCFunction_Call() now raise a
  SystemError if a function returns a result and raises an exception.
  The SystemError is chained to the previous exception.


Library
-------

* bpo-22524: New os.scandir() function, part of the PEP 471:
  "os.scandir() function -- a better and faster directory iterator".
  Patch written by Ben Hoyt.

* bpo-23103: Reduced the memory consumption of IPv4Address and
  IPv6Address.

* bpo-21793: BaseHTTPRequestHandler again logs response code as
  numeric, not as stringified enum.  Patch by Demian Brecht.

* bpo-23476: In the ssl module, enable OpenSSL's
  X509_V_FLAG_TRUSTED_FIRST flag on certificate stores when it is
  available.

* bpo-23576: Avoid stalling in SSL reads when EOF has been reached
  in the SSL layer but the underlying connection hasn't been closed.

* bpo-23504: Added an __all__ to the types module.

* bpo-23563: Optimized utility functions in urllib.parse.

* bpo-7830: Flatten nested functools.partial.

* bpo-20204: Added the __module__ attribute to _tkinter classes.

* bpo-19980: Improved help() for non-recognized strings.  help('')
  now shows the help on str.  help('help') now shows the help on
  help(). Original patch by Mark Lawrence.

* bpo-23521: Corrected pure python implementation of timedelta
  division.

  Eliminated OverflowError from "timedelta * float" for some floats;
  Corrected rounding in timedlta true division.

* bpo-21619: Popen objects no longer leave a zombie after exit in
  the with statement if the pipe was broken.  Patch by Martin Panter.

* bpo-22936: Make it possible to show local variables in tracebacks
  for both the traceback module and unittest.

* bpo-15955: Add an option to limit the output size in
  bz2.decompress(). Patch by Nikolaus Rath.

* bpo-6639: Module-level turtle functions no longer raise TclError
  after closing the window.

* bpo-814253: Group references and conditional group references now
  work in lookbehind assertions in regular expressions. (See also:
  bpo-9179)

* bpo-23215: Multibyte codecs with custom error handlers that
  ignores errors consumed too much memory and raised SystemError or
  MemoryError. Original patch by Aleksi Torhamo.

* bpo-5700: io.FileIO() called flush() after closing the file.
  flush() was not called in close() if closefd=False.

* bpo-23374: Fixed pydoc failure with non-ASCII files when stdout
  encoding differs from file system encoding (e.g. on Mac OS).

* bpo-23481: Remove RC4 from the SSL module's default cipher list.

* bpo-21548: Fix pydoc.synopsis() and pydoc.apropos() on modules
  with empty docstrings.

* bpo-22885: Fixed arbitrary code execution vulnerability in the
  dbm.dumb module. Original patch by Claudiu Popa.

* bpo-23239: ssl.match_hostname() now supports matching of IP
  addresses.

* bpo-23146: Fix mishandling of absolute Windows paths with forward
  slashes in pathlib.

* bpo-23096: Pickle representation of floats with protocol 0 now is
  the same for both Python and C implementations.

* bpo-19105: pprint now more efficiently uses free space at the
  right.

* bpo-14910: Add allow_abbrev parameter to argparse.ArgumentParser.
  Patch by Jonathan Paugh, Steven Bethard, paul j3 and Daniel
  Eriksson.

* bpo-21717: tarfile.open() now supports 'x' (exclusive creation)
  mode.

* bpo-23344: marshal.dumps() is now 20-25% faster on average.

* bpo-20416: marshal.dumps() with protocols 3 and 4 is now 40-50%
  faster on average.

* bpo-23421: Fixed compression in tarfile CLI.  Patch by wdv4758h.

* bpo-23367: Fix possible overflows in the unicodedata module.

* bpo-23361: Fix possible overflow in Windows subprocess creation
  code.

* logging.handlers.QueueListener now takes a respect_handler_level
  keyword argument which, if set to True, will pass messages to
  handlers taking handler levels into account.

* bpo-19705: turtledemo now has a visual sorting algorithm demo.
  Original patch from Jason Yeo.

* bpo-23801: Fix issue where cgi.FieldStorage did not always ignore
  the entire preamble to a multipart body.


Build
-----

* bpo-23445: pydebug builds now use "gcc -Og" where possible, to
  make the resulting executable faster.

* bpo-23686: Update OS X 10.5 installer build to use OpenSSL 1.0.2a.


C API
-----

* bpo-20204: Deprecation warning is now raised for builtin types
  without the __module__ attribute.


Windows
-------

* bpo-23465: Implement PEP 486 - Make the Python Launcher aware of
  virtual environments. Patch by Paul Moore.

* bpo-23437: Make user scripts directory versioned on Windows. Patch
  by Paul Moore.


Python 3.5.0 alpha 1
====================

*Release date: 2015-02-08*


Core and Builtins
-----------------

* bpo-23285: PEP 475 - EINTR handling.

* bpo-22735: Fix many edge cases (including crashes) involving
  custom mro() implementations.

* bpo-22896: Avoid using PyObject_AsCharBuffer(),
  PyObject_AsReadBuffer() and PyObject_AsWriteBuffer().

* bpo-21295: Revert some changes (bpo-16795) to AST line numbers and
  column offsets that constituted a regression.

* bpo-22986: Allow changing an object's __class__ between a dynamic
  type and static type in some cases.

* bpo-15859: PyUnicode_EncodeFSDefault(), PyUnicode_EncodeMBCS() and
  PyUnicode_EncodeCodePage() now raise an exception if the object is
  not a Unicode object. For PyUnicode_EncodeFSDefault(), it was
  already the case on platforms other than Windows. Patch written by
  Campbell Barton.

* bpo-21408: The default __ne__() now returns NotImplemented if
  __eq__() returned NotImplemented.  Original patch by Martin Panter.

* bpo-23321: Fixed a crash in str.decode() when error handler
  returned replacment string longer than mailformed input data.

* bpo-22286: The "backslashreplace" error handlers now works with
  decoding and translating.

* bpo-23253: Delay-load ShellExecute[AW] in os.startfile for reduced
  startup overhead on Windows.

* bpo-22038: pyatomic.h now uses stdatomic.h or GCC built-in
  functions for atomic memory access if available. Patch written by
  Vitor de Lima and Gustavo Temple.

* bpo-20284: %-interpolation (aka printf) formatting added for bytes
  and bytearray.

* bpo-23048: Fix jumping out of an infinite while loop in the pdb.

* bpo-20335: bytes constructor now raises TypeError when encoding or
  errors is specified with non-string argument.  Based on patch by
  Renaud Blanch.

* bpo-22834: If the current working directory ends up being set to a
  non-existent directory then import will no longer raise
  FileNotFoundError.

* bpo-22869: Move the interpreter startup & shutdown code to a new
  dedicated pylifecycle.c module

* bpo-22847: Improve method cache efficiency.

* bpo-22335: Fix crash when trying to enlarge a bytearray to
  0x7fffffff bytes on a 32-bit platform.

* bpo-22653: Fix an assertion failure in debug mode when doing a
  reentrant dict insertion in debug mode.

* bpo-22643: Fix integer overflow in Unicode case operations (upper,
  lower, title, swapcase, casefold).

* bpo-17636: Circular imports involving relative imports are now
  supported.

* bpo-22604: Fix assertion error in debug mode when dividing a
  complex number by (nan+0j).

* bpo-21052: Do not raise ImportWarning when sys.path_hooks or
  sys.meta_path are set to None.

* bpo-16518: Use 'bytes-like object required' in error messages that
  previously used the far more cryptic "'x' does not support the
  buffer protocol.

* bpo-22470: Fixed integer overflow issues in "backslashreplace",
  "xmlcharrefreplace", and "surrogatepass" error handlers.

* bpo-22540: speed up "PyObject_IsInstance" and
  "PyObject_IsSubclass" in the common case that the second argument
  has metaclass "type".

* bpo-18711: Add a new "PyErr_FormatV" function, similar to
  "PyErr_Format" but accepting a "va_list" argument.

* bpo-22520: Fix overflow checking when generating the repr of a
  unicode object.

* bpo-22519: Fix overflow checking in PyBytes_Repr.

* bpo-22518: Fix integer overflow issues in latin-1 encoding.

* bpo-16324: _charset parameter of MIMEText now also accepts
  email.charset.Charset instances. Initial patch by Claude Paroz.

* bpo-1764286: Fix inspect.getsource() to support decorated
  functions. Patch by Claudiu Popa.

* bpo-18554: os.__all__ includes posix functions.

* bpo-21391: Use os.path.abspath in the shutil module.

* bpo-11471: avoid generating a JUMP_FORWARD instruction at the end
  of an if-block if there is no else-clause.  Original patch by Eugene
  Toder.

* bpo-22215: Now ValueError is raised instead of TypeError when str
  or bytes argument contains not permitted null character or byte.

* bpo-22258: Fix the internal function set_inheritable() on Illumos.
  This platform exposes the function "ioctl(FIOCLEX)", but calling it
  fails with errno is ENOTTY: "Inappropriate ioctl for device".
  set_inheritable() now falls back to the slower "fcntl()" ("F_GETFD"
  and then "F_SETFD").

* bpo-21389: Displaying the __qualname__ of the underlying function
  in the repr of a bound method.

* bpo-22206: Using pthread, PyThread_create_key() now sets errno to
  ENOMEM and returns -1 (error) on integer overflow.

* bpo-20184: Argument Clinic based signature introspection added for
  30 of the builtin functions.

* bpo-22116: C functions and methods (of the
  'builtin_function_or_method' type) can now be weakref'ed.  Patch by
  Wei Wu.

* bpo-22077: Improve index error messages for bytearrays, bytes,
  lists, and tuples by adding 'or slices'. Added ', not <typename>'
  for bytearrays. Original patch by Claudiu Popa.

* bpo-20179: Apply Argument Clinic to bytes and bytearray. Patch by
  Tal Einat.

* bpo-22082: Clear interned strings in slotdefs.

* Upgrade Unicode database to Unicode 7.0.0.

* bpo-21897: Fix a crash with the f_locals attribute with closure
  variables when frame.clear() has been called.

* bpo-21205: Add a new "__qualname__" attribute to generator, the
  qualified name, and use it in the representation of a generator
  ("repr(gen)"). The default name of the generator ("__name__"
  attribute) is now get from the function instead of the code. Use
  "gen.gi_code.co_name" to get the name of the code.

* bpo-21669: With the aid of heuristics in SyntaxError.__init__, the
  parser now attempts to generate more meaningful (or at least more
  search engine friendly) error messages when "exec" and "print" are
  used as statements.

* bpo-21642: In the conditional if-else expression, allow an integer
  written with no space between itself and the "else" keyword (e.g.
  "True if 42else False") to be valid syntax.

* bpo-21523: Fix over-pessimistic computation of the stack effect of
  some opcodes in the compiler.  This also fixes a quadratic
  compilation time issue noticeable when compiling code with a large
  number of "and" and "or" operators.

* bpo-21418: Fix a crash in the builtin function super() when called
  without argument and without current frame (ex: embedded Python).

* bpo-21425: Fix flushing of standard streams in the interactive
  interpreter.

* bpo-21435: In rare cases, when running finalizers on objects in
  cyclic trash a bad pointer dereference could occur due to a subtle
  flaw in internal iteration logic.

* bpo-21377: PyBytes_Concat() now tries to concatenate in-place when
  the first argument has a reference count of 1.  Patch by Nikolaus
  Rath.

* bpo-20355: -W command line options now have higher priority than
  the PYTHONWARNINGS environment variable.  Patch by Arfrever.

* bpo-21274: Define PATH_MAX for GNU/Hurd in Python/pythonrun.c.

* bpo-20904: Support setting FPU precision on m68k.

* bpo-21209: Fix sending tuples to custom generator objects with the
  yield from syntax.

* bpo-21193: pow(a, b, c) now raises ValueError rather than
  TypeError when b is negative. Patch by Josh Rosenberg.

* bpo-21176: PEP 465: Add the '@' operator for matrix
  multiplication.

* bpo-21134: Fix segfault when str is called on an uninitialized
  UnicodeEncodeError, UnicodeDecodeError, or UnicodeTranslateError
  object.

* bpo-19537: Fix PyUnicode_DATA() alignment under m68k.  Patch by
  Andreas Schwab.

* bpo-20929: Add a type cast to avoid shifting a negative number.

* bpo-20731: Properly position in source code files even if they are
  opened in text mode. Patch by Serhiy Storchaka.

* bpo-20637: Key-sharing now also works for instance dictionaries of
  subclasses.  Patch by Peter Ingebretson.

* bpo-8297: Attributes missing from modules now include the module
  name in the error text.  Original patch by ysj.ray.

* bpo-19995: %c, %o, %x, and %X now raise TypeError on non-integer
  input.

* bpo-19655: The ASDL parser - used by the build process to generate
  code for managing the Python AST in C - was rewritten. The new
  parser is self contained and does not require to carry long the
  spark.py parser-generator library; spark.py was removed from the
  source base.

* bpo-12546: Allow "\x00" to be used as a fill character when using
  str, int, float, and complex __format__ methods.

* bpo-20480: Add ipaddress.reverse_pointer. Patch by Leon Weber.

* bpo-13598: Modify string.Formatter to support auto-numbering of
  replacement fields. It now matches the behavior of str.format() in
  this regard. Patches by Phil Elson and Ramchandra Apte.

* bpo-8931: Make alternate formatting ('#') for type 'c' raise an
  exception. In versions prior to 3.5, '#' with 'c' had no effect. Now
  specifying it is an error. Patch by Torsten Landschoff.

* bpo-23165: Perform overflow checks before allocating memory in the
  _Py_char2wchar function.


Library
-------

* bpo-23399: pyvenv creates relative symlinks where possible.

* bpo-20289: cgi.FieldStorage() now supports the context management
  protocol.

* bpo-13128: Print response headers for CONNECT requests when
  debuglevel > 0. Patch by Demian Brecht.

* bpo-15381: Optimized io.BytesIO to make less allocations and
  copyings.

* bpo-22818: Splitting on a pattern that could match an empty string
  now raises a warning.  Patterns that can only match empty strings
  are now rejected.

* bpo-23099: Closing io.BytesIO with exported buffer is rejected now
  to prevent corrupting exported buffer.

* bpo-23326: Removed __ne__ implementations.  Since fixing default
  __ne__ implementation in bpo-21408 they are redundant.

* bpo-23363: Fix possible overflow in itertools.permutations.

* bpo-23364: Fix possible overflow in itertools.product.

* bpo-23366: Fixed possible integer overflow in
  itertools.combinations.

* bpo-23369: Fixed possible integer overflow in
  _json.encode_basestring_ascii.

* bpo-23353: Fix the exception handling of generators in
  PyEval_EvalFrameEx(). At entry, save or swap the exception state
  even if PyEval_EvalFrameEx() is called with throwflag=0. At exit,
  the exception state is now always restored or swapped, not only if
  why is WHY_YIELD or WHY_RETURN. Patch co-written with Antoine
  Pitrou.

* bpo-14099: Restored support of writing ZIP files to tellable but
  non-seekable streams.

* bpo-14099: Writing to ZipFile and reading multiple ZipExtFiles is
  threadsafe now.

* bpo-19361: JSON decoder now raises JSONDecodeError instead of
  ValueError.

* bpo-18518: timeit now rejects statements which can't be compiled
  outside a function or a loop (e.g. "return" or "break").

* bpo-23094: Fixed readline with frames in Python implementation of
  pickle.

* bpo-23268: Fixed bugs in the comparison of ipaddress classes.

* bpo-21408: Removed incorrect implementations of __ne__() which
  didn't returned NotImplemented if __eq__() returned NotImplemented.
  The default __ne__() now works correctly.

* bpo-19996: "email.feedparser.FeedParser" now handles (malformed)
  headers with no key rather than assuming the body has started.

* bpo-20188: Support Application-Layer Protocol Negotiation (ALPN)
  in the ssl module.

* bpo-23133: Pickling of ipaddress objects now produces more compact
  and portable representation.

* bpo-23248: Update ssl error codes from latest OpenSSL git master.

* bpo-23266: Much faster implementation of
  ipaddress.collapse_addresses() when there are many non-consecutive
  addresses.

* bpo-23098: 64-bit dev_t is now supported in the os module.

* bpo-21817: When an exception is raised in a task submitted to a
  ProcessPoolExecutor, the remote traceback is now displayed in the
  parent process.  Patch by Claudiu Popa.

* bpo-15955: Add an option to limit output size when decompressing
  LZMA data.  Patch by Nikolaus Rath and Martin Panter.

* bpo-23250: In the http.cookies module, capitalize "HttpOnly" and
  "Secure" as they are written in the standard.

* bpo-23063: In the disutils' check command, fix parsing of reST
  with code or code-block directives.

* bpo-23209: selectors.BaseSelector.get_key() now raises a
  RuntimeError if the selector is closed. And
  selectors.BaseSelector.close() now clears its internal reference to
  the selector mapping to break a reference cycle. Initial patch
  written by Martin Richard. (See also: bpo-23225)

* bpo-17911: Provide a way to seed the linecache for a PEP-302
  module without actually loading the code.

* bpo-17911: Provide a new object API for traceback, including the
  ability to not lookup lines at all until the traceback is actually
  rendered, without any trace of the original objects being kept
  alive.

* bpo-19777: Provide a home() classmethod on Path objects.
  Contributed by Victor Salgado and Mayank Tripathi.

* bpo-23206: Make "json.dumps(..., ensure_ascii=False)" as fast as
  the default case of "ensure_ascii=True".  Patch by Naoki Inada.

* bpo-23185: Add math.inf and math.nan constants.

* bpo-23186: Add ssl.SSLObject.shared_ciphers() and
  ssl.SSLSocket.shared_ciphers() to fetch the client's list ciphers
  sent at handshake.

* bpo-23143: Remove compatibility with OpenSSLs older than 0.9.8.

* bpo-23132: Improve performance and introspection support of
  comparison methods created by functool.total_ordering.

* bpo-19776: Add an expanduser() method on Path objects.

* bpo-23112: Fix SimpleHTTPServer to correctly carry the query
  string and fragment when it redirects to add a trailing slash.

* bpo-21793: Added http.HTTPStatus enums (i.e. HTTPStatus.OK,
  HTTPStatus.NOT_FOUND). Patch by Demian Brecht.

* bpo-23093: In the io, module allow more operations to work on
  detached streams.

* bpo-23111: In the ftplib, make ssl.PROTOCOL_SSLv23 the default
  protocol version.

* bpo-22585: On OpenBSD 5.6 and newer, os.urandom() now calls
  getentropy(), instead of reading /dev/urandom, to get pseudo-random
  bytes.

* bpo-19104: pprint now produces evaluable output for wrapped
  strings.

* bpo-23071: Added missing names to codecs.__all__.  Patch by Martin
  Panter.

* bpo-22783: Pickling now uses the NEWOBJ opcode instead of the
  NEWOBJ_EX opcode if possible.

* bpo-15513: Added a __sizeof__ implementation for pickle classes.

* bpo-19858: pickletools.optimize() now aware of the MEMOIZE opcode,
  can produce more compact result and no longer produces invalid
  output if input data contains MEMOIZE opcodes together with PUT or
  BINPUT opcodes.

* bpo-22095: Fixed HTTPConnection.set_tunnel with default port.  The
  port value in the host header was set to "None".  Patch by Demian
  Brecht.

* bpo-23016: A warning no longer produces an AttributeError when the
  program is run with pythonw.exe.

* bpo-21775: shutil.copytree(): fix crash when copying to VFAT. An
  exception handler assumed that OSError objects always have a
  'winerror' attribute. That is not the case, so the exception handler
  itself raised AttributeError when run on Linux (and, presumably, any
  other non-Windows OS). Patch by Greg Ward.

* bpo-1218234: Fix inspect.getsource() to load updated source of
  reloaded module. Initial patch by Berker Peksag.

* bpo-21740: Support wrapped callables in doctest. Patch by Claudiu
  Popa.

* bpo-23009: Make sure selectors.EpollSelecrtor.select() works when
  no FD is registered.

* bpo-22959: In the constructor of http.client.HTTPSConnection,
  prefer the context's check_hostname attribute over the
  *check_hostname* parameter.

* bpo-22696: Add function "sys.is_finalizing()" to know about
  interpreter shutdown.

* bpo-16043: Add a default limit for the amount of data
  xmlrpclib.gzip_decode will return. This resolves CVE-2013-1753.

* bpo-14099: ZipFile.open() no longer reopen the underlying file.
  Objects returned by ZipFile.open() can now operate independently of
  the ZipFile even if the ZipFile was created by passing in a file-
  like object as the first argument to the constructor.

* bpo-22966: Fix __pycache__ pyc file name clobber when pyc_compile
  is asked to compile a source file containing multiple dots in the
  source file name.

* bpo-21971: Update turtledemo doc and add module to the index.

* bpo-21032: Fixed socket leak if HTTPConnection.getresponse()
  fails. Original patch by Martin Panter.

* bpo-22407: Deprecated the use of re.LOCALE flag with str patterns
  or re.ASCII. It was newer worked.

* bpo-22902: The "ip" command is now used on Linux to determine MAC
  address in uuid.getnode().  Pach by Bruno Cauet.

* bpo-22960: Add a context argument to xmlrpclib.ServerProxy
  constructor.

* bpo-22389: Add contextlib.redirect_stderr().

* bpo-21356: Make ssl.RAND_egd() optional to support LibreSSL. The
  availability of the function is checked during the compilation.
  Patch written by Bernard Spil.

* bpo-22915: SAX parser now supports files opened with file
  descriptor or bytes path.

* bpo-22609: Constructors and update methods of mapping classes in
  the collections module now accept the self keyword argument.

* bpo-22940: Add readline.append_history_file.

* bpo-19676: Added the "namereplace" error handler.

* bpo-22788: Add *context* parameter to
  logging.handlers.HTTPHandler.

* bpo-22921: Allow SSLContext to take the *hostname* parameter even
  if OpenSSL doesn't support SNI.

* bpo-22894: TestCase.subTest() would cause the test suite to be
  stopped when in failfast mode, even in the absence of failures.

* bpo-22796: HTTP cookie parsing is now stricter, in order to
  protect against potential injection attacks.

* bpo-22370: Windows detection in pathlib is now more robust.

* bpo-22841: Reject coroutines in asyncio add_signal_handler().
  Patch by Ludovic.Gasc.

* bpo-19494: Added urllib.request.HTTPBasicPriorAuthHandler. Patch
  by Matej Cepl.

* bpo-22578: Added attributes to the re.error class.

* bpo-22849: Fix possible double free in the io.TextIOWrapper
  constructor.

* bpo-12728: Different Unicode characters having the same uppercase
  but different lowercase are now matched in case-insensitive regular
  expressions.

* bpo-22821: Fixed fcntl() with integer argument on 64-bit big-
  endian platforms.

* bpo-21650: Add an "--sort-keys" option to json.tool CLI.

* bpo-22824: Updated reprlib output format for sets to use set
  literals. Patch contributed by Berker Peksag.

* bpo-22824: Updated reprlib output format for arrays to display
  empty arrays without an unnecessary empty list.  Suggested by Serhiy
  Storchaka.

* bpo-22406: Fixed the uu_codec codec incorrectly ported to 3.x.
  Based on patch by Martin Panter.

* bpo-17293: uuid.getnode() now determines MAC address on AIX using
  netstat. Based on patch by Aivars Kalvāns.

* bpo-22769: Fixed ttk.Treeview.tag_has() when called without
  arguments.

* bpo-22417: Verify certificates by default in httplib (PEP 476).

* bpo-22775: Fixed unpickling of http.cookies.SimpleCookie with
  protocol 2 and above. Patch by Tim Graham.

* bpo-22776: Brought excluded code into the scope of a try block in
  SysLogHandler.emit().

* bpo-22665: Add missing get_terminal_size and SameFileError to
  shutil.__all__.

* bpo-6623: Remove deprecated Netrc class in the ftplib module.
  Patch by Matt Chaput.

* bpo-17381: Fixed handling of case-insensitive ranges in regular
  expressions.

* bpo-22410: Module level functions in the re module now cache
  compiled locale-dependent regular expressions taking into account
  the locale.

* bpo-22759: Query methods on pathlib.Path() (exists(), is_dir(),
  etc.) now return False when the underlying stat call raises
  NotADirectoryError.

* bpo-8876: distutils now falls back to copying files when hard
  linking doesn't work. This allows use with special filesystems such
  as VirtualBox shared folders.

* bpo-22217: Implemented reprs of classes in the zipfile module.

* bpo-22457: Honour load_tests in the start_dir of discovery.

* bpo-18216: gettext now raises an error when a .mo file has an
  unsupported major version number.  Patch by Aaron Hill.

* bpo-13918: Provide a locale.delocalize() function which can remove
  locale-specific number formatting from a string representing a
  number, without then converting it to a specific type.  Patch by
  Cédric Krier.

* bpo-22676: Make the pickling of global objects which don't have a
  __module__ attribute less slow.

* bpo-18853: Fixed ResourceWarning in shlex.__nain__.

* bpo-9351: Defaults set with set_defaults on an argparse subparser
  are no longer ignored when also set on the parent parser.

* bpo-7559: unittest test loading ImportErrors are reported as
  import errors with their import exception rather than as attribute
  errors after the import has already failed.

* bpo-19746: Make it possible to examine the errors from unittest
  discovery without executing the test suite. The new "errors"
  attribute on TestLoader exposes these non-fatal errors encountered
  during discovery.

* bpo-21991: Make email.headerregistry's header 'params' attributes
  be read-only (MappingProxyType).  Previously the dictionary was
  modifiable but a new one was created on each access of the
  attribute.

* bpo-22638: SSLv3 is now disabled throughout the standard library.
  It can still be enabled by instantiating a SSLContext manually.

* bpo-22641: In asyncio, the default SSL context for client
  connections is now created using ssl.create_default_context(), for
  stronger security.

* bpo-17401: Include closefd in io.FileIO repr.

* bpo-21338: Add silent mode for compileall. quiet parameters of
  compile_{dir, file, path} functions now have a multilevel value.
  Also, -q option of the CLI now have a multilevel value. Patch by
  Thomas Kluyver.

* bpo-20152: Convert the array and cmath modules to Argument Clinic.

* bpo-18643: Add socket.socketpair() on Windows.

* bpo-22435: Fix a file descriptor leak when socketserver bind
  fails.

* bpo-13096: Fixed segfault in CTypes POINTER handling of large
  values.

* bpo-11694: Raise ConversionError in xdrlib as documented.  Patch
  by Filip Gruszczyński and Claudiu Popa.

* bpo-19380: Optimized parsing of regular expressions.

* bpo-1519638: Now unmatched groups are replaced with empty strings
  in re.sub() and re.subn().

* bpo-18615: sndhdr.what/whathdr now return a namedtuple.

* bpo-22462: Fix pyexpat's creation of a dummy frame to make it
  appear in exception tracebacks.

* bpo-21965: Add support for in-memory SSL to the ssl module.  Patch
  by Geert Jansen.

* bpo-21173: Fix len() on a WeakKeyDictionary when .clear() was
  called with an iterator alive.

* bpo-11866: Eliminated race condition in the computation of names
  for new threads.

* bpo-21905: Avoid RuntimeError in pickle.whichmodule() when
  sys.modules is mutated while iterating.  Patch by Olivier Grisel.

* bpo-11271: concurrent.futures.Executor.map() now takes a
  *chunksize* argument to allow batching of tasks in child processes
  and improve performance of ProcessPoolExecutor.  Patch by Dan
  O'Reilly.

* bpo-21883: os.path.join() and os.path.relpath() now raise a
  TypeError with more helpful error message for unsupported or
  mismatched types of arguments.

* bpo-22219: The zipfile module CLI now adds entries for directories
  (including empty directories) in ZIP file.

* bpo-22449: In the ssl.SSLContext.load_default_certs, consult the
  environmental variables SSL_CERT_DIR and SSL_CERT_FILE on Windows.

* bpo-22508: The email.__version__ variable has been removed; the
  email code is no longer shipped separately from the stdlib, and
  __version__ hasn't been updated in several releases.

* bpo-20076: Added non derived UTF-8 aliases to locale aliases
  table.

* bpo-20079: Added locales supported in glibc 2.18 to locale alias
  table.

* bpo-20218: Added convenience methods read_text/write_text and
  read_bytes/ write_bytes to pathlib.Path objects.

* bpo-22396: On 32-bit AIX platform, don't expose os.posix_fadvise()
  nor os.posix_fallocate() because their prototypes in system headers
  are wrong.

* bpo-22517: When an io.BufferedRWPair object is deallocated, clear
  its weakrefs.

* bpo-22437: Number of capturing groups in regular expression is no
  longer limited by 100.

* bpo-17442: InteractiveInterpreter now displays the full chained
  traceback in its showtraceback method, to match the built in
  interactive interpreter.

* bpo-23392: Added tests for marshal C API that works with FILE*.

* bpo-10510: distutils register and upload methods now use HTML
  standards compliant CRLF line endings.

* bpo-9850: Fixed macpath.join() for empty first component.  Patch
  by Oleg Oshmyan.

* bpo-5309: distutils' build and build_ext commands now accept a
  "-j" option to enable parallel building of extension modules.

* bpo-22448: Improve canceled timer handles cleanup to prevent
  unbound memory usage. Patch by Joshua Moore-Oliva.

* bpo-22427: TemporaryDirectory no longer attempts to clean up twice
  when used in the with statement in generator.

* bpo-22362: Forbidden ambiguous octal escapes out of range 0-0o377
  in regular expressions.

* bpo-20912: Now directories added to ZIP file have correct Unix and
  MS-DOS directory attributes.

* bpo-21866: ZipFile.close() no longer writes ZIP64 central
  directory records if allowZip64 is false.

* bpo-22278: Fix urljoin problem with relative urls, a regression
  observed after changes to issue22118 were submitted.

* bpo-22415: Fixed debugging output of the GROUPREF_EXISTS opcode in
  the re module. Removed trailing spaces in debugging output.

* bpo-22423: Unhandled exception in thread no longer causes
  unhandled AttributeError when sys.stderr is None.

* bpo-21332: Ensure that "bufsize=1" in subprocess.Popen() selects
  line buffering, rather than block buffering.  Patch by Akira Li.

* bpo-21091: Fix API bug: email.message.EmailMessage.is_attachment
  is now a method.

* bpo-21079: Fix email.message.EmailMessage.is_attachment to return
  the correct result when the header has parameters as well as a
  value.

* bpo-22247: Add NNTPError to nntplib.__all__.

* bpo-22366: urllib.request.urlopen will accept a context object
  (SSLContext) as an argument which will then be used for HTTPS
  connection. Patch by Alex Gaynor.

* bpo-4180: The warnings registries are now reset when the filters
  are modified.

* bpo-22419: Limit the length of incoming HTTP request in wsgiref
  server to 65536 bytes and send a 414 error code for higher lengths.
  Patch contributed by Devin Cook.

* Lax cookie parsing in http.cookies could be a security issue when
  combined with non-standard cookie handling in some Web browsers.
  Reported by Sergey Bobrov.

* bpo-20537: logging methods now accept an exception instance as
  well as a Boolean value or exception tuple. Thanks to Yury Selivanov
  for the patch.

* bpo-22384: An exception in Tkinter callback no longer crashes the
  program when it is run with pythonw.exe.

* bpo-22168: Prevent turtle AttributeError with non-default Canvas
  on OS X.

* bpo-21147: sqlite3 now raises an exception if the request contains
  a null character instead of truncating it.  Based on patch by Victor
  Stinner.

* bpo-13968: The glob module now supports recursive search in
  subdirectories using the "**" pattern.

* bpo-21951: Fixed a crash in Tkinter on AIX when called Tcl command
  with empty string or tuple argument.

* bpo-21951: Tkinter now most likely raises MemoryError instead of
  crash if the memory allocation fails.

* bpo-22338: Fix a crash in the json module on memory allocation
  failure.

* bpo-12410: imaplib.IMAP4 now supports the context management
  protocol. Original patch by Tarek Ziadé.

* bpo-21270: We now override tuple methods in mock.call objects so
  that they can be used as normal call attributes.

* bpo-16662: load_tests() is now unconditionally run when it is
  present in a package's __init__.py. TestLoader.loadTestsFromModule()
  still accepts use_load_tests, but it is deprecated and ignored.  A
  new keyword-only attribute "pattern" is added and documented.  Patch
  given by Robert Collins, tweaked by Barry Warsaw.

* bpo-22226: First letter no longer is stripped from the "status"
  key in the result of Treeview.heading().

* bpo-19524: Fixed resource leak in the HTTP connection when an
  invalid response is received.  Patch by Martin Panter.

* bpo-20421: Add a .version() method to SSL sockets exposing the
  actual protocol version in use.

* bpo-19546: configparser exceptions no longer expose implementation
  details. Chained KeyErrors are removed, which leads to cleaner
  tracebacks. Patch by Claudiu Popa.

* bpo-22051: turtledemo no longer reloads examples to re-run them.
  Initialization of variables and gui setup should be done in main(),
  which is called each time a demo is run, but not on import.

* bpo-21933: Turtledemo users can change the code font size with a
  menu selection or control(command) '-' or '+' or control-mousewheel.
  Original patch by Lita Cho.

* bpo-21597: The separator between the turtledemo text pane and the
  drawing canvas can now be grabbed and dragged with a mouse.  The
  code text pane can be widened to easily view or copy the full width
  of the text.  The canvas can be widened on small screens.  Original
  patches by Jan Kanis and Lita Cho.

* bpo-18132: Turtledemo buttons no longer disappear when the window
  is shrunk.  Original patches by Jan Kanis and Lita Cho.

* bpo-22043: time.monotonic() is now always available.
  "threading.Lock.acquire()", "threading.RLock.acquire()" and socket
  operations now use a monotonic clock, instead of the system clock,
  when a timeout is used.

* bpo-21527: Add a default number of workers to ThreadPoolExecutor
  equal to 5 times the number of CPUs.  Patch by Claudiu Popa.

* bpo-22216: smtplib now resets its state more completely after a
  quit.  The most obvious consequence of the previous behavior was a
  STARTTLS failure during a connect/starttls/quit/connect/starttls
  sequence.

* bpo-22098: ctypes' BigEndianStructure and LittleEndianStructure
  now define an empty __slots__ so that subclasses don't always get an
  instance dict. Patch by Claudiu Popa.

* bpo-22185: Fix an occasional RuntimeError in
  threading.Condition.wait() caused by mutation of the waiters queue
  without holding the lock.  Patch by Doug Zongker.

* bpo-22287: On UNIX, _PyTime_gettimeofday() now uses
  clock_gettime(CLOCK_REALTIME) if available. As a side effect, Python
  now depends on the librt library on Solaris and on Linux (only with
  glibc older than 2.17).

* bpo-22182: Use e.args to unpack exceptions correctly in
  distutils.file_util.move_file. Patch by Claudiu Popa.

* The webbrowser module now uses subprocess's start_new_session=True
  rather than a potentially risky preexec_fn=os.setsid call.

* bpo-22042: signal.set_wakeup_fd(fd) now raises an exception if the
  file descriptor is in blocking mode.

* bpo-16808: inspect.stack() now returns a named tuple instead of a
  tuple. Patch by Daniel Shahaf.

* bpo-22236: Fixed Tkinter images copying operations in
  NoDefaultRoot mode.

* bpo-2527: Add a *globals* argument to timeit functions, in order
  to override the globals namespace in which the timed code is
  executed. Patch by Ben Roberts.

* bpo-22118: Switch urllib.parse to use RFC 3986 semantics for the
  resolution of relative URLs, rather than RFCs 1808 and 2396. Patch
  by Demian Brecht.

* bpo-21549: Added the "members" parameter to TarFile.list().

* bpo-19628: Allow compileall recursion depth to be specified with a
  -r option.

* bpo-15696: Add a __sizeof__ implementation for mmap objects on
  Windows.

* bpo-22068: Avoided reference loops with Variables and Fonts in
  Tkinter.

* bpo-22165: SimpleHTTPRequestHandler now supports undecodable file
  names.

* bpo-15381: Optimized line reading in io.BytesIO.

* bpo-8797: Raise HTTPError on failed Basic Authentication
  immediately. Initial patch by Sam Bull.

* bpo-20729: Restored the use of lazy
  iterkeys()/itervalues()/iteritems() in the mailbox module.

* bpo-21448: Changed FeedParser feed() to avoid O(N**2) behavior
  when parsing long line. Original patch by Raymond Hettinger.

* bpo-22184: The functools LRU Cache decorator factory now gives an
  earlier and clearer error message when the user forgets the required
  parameters.

* bpo-17923: glob() patterns ending with a slash no longer match
  non- dirs on AIX.  Based on patch by Delhallt.

* bpo-21725: Added support for RFC 6531 (SMTPUTF8) in smtpd.

* bpo-22176: Update the ctypes module's libffi to v3.1.  This
  release adds support for the Linux AArch64 and POWERPC ELF ABIv2
  little endian architectures.

* bpo-5411: Added support for the "xztar" format in the shutil
  module.

* bpo-21121: Don't force 3rd party C extensions to be built with
  -Werror=declaration- after-statement.

* bpo-21975: Fixed crash when using uninitialized sqlite3.Row (in
  particular when unpickling pickled sqlite3.Row).  sqlite3.Row is now
  initialized in the __new__() method.

* bpo-20170: Convert posixmodule to use Argument Clinic.

* bpo-21539: Add an *exists_ok* argument to "Pathlib.mkdir()" to
  mimic "mkdir -p" and "os.makedirs()" functionality.  When true,
  ignore FileExistsErrors.  Patch by Berker Peksag.

* bpo-22127: Bypass IDNA for pure-ASCII host names in the socket
  module (in particular for numeric IPs).

* bpo-21047: set the default value for the *convert_charrefs*
  argument of HTMLParser to True.  Patch by Berker Peksag.

* Add an __all__ to html.entities.

* bpo-15114: the strict mode and argument of HTMLParser,
  HTMLParser.error, and the HTMLParserError exception have been
  removed.

* bpo-22085: Dropped support of Tk 8.3 in Tkinter.

* bpo-21580: Now Tkinter correctly handles bytes arguments passed to
  Tk. In particular this allows initializing images from binary data.

* bpo-22003: When initialized from a bytes object, io.BytesIO() now
  defers making a copy until it is mutated, improving performance and
  memory use on some use cases. Patch by David Wilson.

* bpo-22018: On Windows, signal.set_wakeup_fd() now also supports
  sockets. A side effect is that Python depends to the WinSock
  library.

* bpo-22054: Add os.get_blocking() and os.set_blocking() functions
  to get and set the blocking mode of a file descriptor (False if the
  O_NONBLOCK flag is set, True otherwise). These functions are not
  available on Windows.

* bpo-17172: Make turtledemo start as active on OS X even when run
  with subprocess. Patch by Lita Cho.

* bpo-21704: Fix build error for _multiprocessing when semaphores
  are not available. Patch by Arfrever Frehtes Taifersar Arahesis.

* bpo-20173: Convert sha1, sha256, sha512 and md5 to ArgumentClinic.
  Patch by Vajrasky Kok.

* Fix repr(_socket.socket) on Windows 64-bit: don't fail with
  OverflowError on closed socket. repr(socket.socket) already works
  fine.

* bpo-22033: Reprs of most Python implemened classes now contain
  actual class name instead of hardcoded one.

* bpo-21947: The dis module can now disassemble generator-iterator
  objects based on their gi_code attribute. Patch by Clement Rouault.

* bpo-16133: The asynchat.async_chat.handle_read() method now
  ignores BlockingIOError exceptions.

* bpo-22044: Fixed premature DECREF in call_tzinfo_method. Patch by
  Tom Flanagan.

* bpo-19884: readline: Disable the meta modifier key if stdout is
  not a terminal to not write the ANSI sequence ""\033[1034h"" into
  stdout. This sequence is used on some terminal (ex: TERM=xterm-
  256color") to enable support of 8 bit characters.

* bpo-4350: Removed a number of out-of-dated and non-working for a
  long time Tkinter methods.

* bpo-6167: Scrollbar.activate() now returns the name of active
  element if the argument is not specified.  Scrollbar.set() now
  always accepts only 2 arguments.

* bpo-15275: Clean up and speed up the ntpath module.

* bpo-21888: plistlib's load() and loads() now work if the fmt
  parameter is specified.

* bpo-22032: __qualname__ instead of __name__ is now always used to
  format fully qualified class names of Python implemented classes.

* bpo-22031: Reprs now always use hexadecimal format with the "0x"
  prefix when contain an id in form " at 0x...".

* bpo-22018: signal.set_wakeup_fd() now raises an OSError instead of
  a ValueError on "fstat()" failure.

* bpo-21044: tarfile.open() now handles fileobj with an integer
  'name' attribute.  Based on patch by Antoine Pietri.

* bpo-21966: Respect -q command-line option when code module is ran.

* bpo-19076: Don't pass the redundant 'file' argument to
  self.error().

* bpo-16382: Improve exception message of warnings.warn() for bad
  category. Initial patch by Phil Elson.

* bpo-21932: os.read() now uses a "Py_ssize_t()" type instead of
  "int" for the size to support reading more than 2 GB at once. On
  Windows, the size is truncted to INT_MAX. As any call to os.read(),
  the OS may read less bytes than the number of requested bytes.

* bpo-21942: Fixed source file viewing in pydoc's server mode on
  Windows.

* bpo-11259: asynchat.async_chat().set_terminator() now raises a
  ValueError if the number of received bytes is negative.

* bpo-12523: asynchat.async_chat.push() now raises a TypeError if it
  doesn't get a bytes string

* bpo-21707: Add missing kwonlyargcount argument to
  ModuleFinder.replace_paths_in_code().

* bpo-20639: calling Path.with_suffix('') allows removing the suffix
  again. Patch by July Tikhonov.

* bpo-21714: Disallow the construction of invalid paths using
  Path.with_name().  Original patch by Antony Lee.

* bpo-15014: Added 'auth' method to smtplib to make implementing
  auth mechanisms simpler, and used it internally in the login method.

* bpo-21151: Fixed a segfault in the winreg module when "None" is
  passed as a "REG_BINARY" value to SetValueEx.  Patch by John
  Ehresman.

* bpo-21090: io.FileIO.readall() does not ignore I/O errors anymore.
  Before, it ignored I/O errors if at least the first C call read()
  succeed.

* bpo-5800: headers parameter of wsgiref.headers.Headers is now
  optional. Initial patch by Pablo Torres Navarrete and SilentGhost.

* bpo-21781: ssl.RAND_add() now supports strings longer than 2 GB.

* bpo-21679: Prevent extraneous fstat() calls during open().  Patch
  by Bohuslav Kabrda.

* bpo-21863: cProfile now displays the module name of C extension
  functions, in addition to their own name.

* bpo-11453: asyncore: emit a ResourceWarning when an unclosed
  file_wrapper object is destroyed. The destructor now closes the file
  if needed. The close() method can now be called twice: the second
  call does nothing.

* bpo-21858: Better handling of Python exceptions in the sqlite3
  module.

* bpo-21476: Make sure the email.parser.BytesParser TextIOWrapper is
  discarded after parsing, so the input file isn't unexpectedly
  closed.

* bpo-20295: imghdr now recognizes OpenEXR format images.

* bpo-21729: Used the "with" statement in the dbm.dumb module to
  ensure files closing. Patch by Claudiu Popa.

* bpo-21491: socketserver: Fix a race condition in child processes
  reaping.

* bpo-21719: Added the "st_file_attributes" field to os.stat_result
  on Windows.

* bpo-21832: Require named tuple inputs to be exact strings.

* bpo-21722: The distutils "upload" command now exits with a non-
  zero return code when uploading fails.  Patch by Martin Dengler.

* bpo-21723: asyncio.Queue: support any type of number (ex: float)
  for the maximum size. Patch written by Vajrasky Kok.

* bpo-21711: support for "site-python" directories has now been
  removed from the site module (it was deprecated in 3.4).

* bpo-17552: new socket.sendfile() method allowing a file to be sent
  over a socket by using high-performance os.sendfile() on UNIX. Patch
  by Giampaolo Rodola'.

* bpo-18039: dbm.dump.open() now always creates a new database when
  the flag has the value 'n'.  Patch by Claudiu Popa.

* bpo-21326: Add a new is_closed() method to asyncio.BaseEventLoop.
  run_forever() and run_until_complete() methods of
  asyncio.BaseEventLoop now raise an exception if the event loop was
  closed.

* bpo-21766: Prevent a security hole in CGIHTTPServer by URL
  unquoting paths before checking for a CGI script at that path.

* bpo-21310: Fixed possible resource leak in failed open().

* bpo-21256: Printout of keyword args should be in deterministic
  order in a mock function call. This will help to write better
  doctests.

* bpo-21677: Fixed chaining nonnormalized exceptions in io close()
  methods.

* bpo-11709: Fix the pydoc.help function to not fail when sys.stdin
  is not a valid file.

* bpo-21515: tempfile.TemporaryFile now uses os.O_TMPFILE flag is
  available.

* bpo-13223: Fix pydoc.writedoc so that the HTML documentation for
  methods that use 'self' in the example code is generated correctly.

* bpo-21463: In urllib.request, fix pruning of the FTP cache.

* bpo-21618: The subprocess module could fail to close open fds that
  were inherited by the calling process and already higher than POSIX
  resource limits would otherwise allow.  On systems with a
  functioning /proc/self/fd or /dev/fd interface the max is now
  ignored and all fds are closed.

* bpo-20383: Introduce importlib.util.module_from_spec() as the
  preferred way to create a new module.

* bpo-21552: Fixed possible integer overflow of too long string
  lengths in the tkinter module on 64-bit platforms.

* bpo-14315: The zipfile module now ignores extra fields in the
  central directory that are too short to be parsed instead of letting
  a struct.unpack error bubble up as this "bad data" appears in many
  real world zip files in the wild and is ignored by other zip tools.

* bpo-13742: Added "key" and "reverse" parameters to heapq.merge().
  (First draft of patch contributed by Simon Sapin.)

* bpo-21402: tkinter.ttk now works when default root window is not
  set.

* bpo-3015: _tkinter.create() now creates tkapp object with
  wantobject=1 by default.

* bpo-10203: sqlite3.Row now truly supports sequence protocol.  In
  particular it supports reverse() and negative indices.  Original
  patch by Claudiu Popa.

* bpo-18807: If copying (no symlinks) specified for a venv, then the
  python interpreter aliases (python, python3) are now created by
  copying rather than symlinking.

* bpo-20197: Added support for the WebP image type in the imghdr
  module. Patch by Fabrice Aneche and Claudiu Popa.

* bpo-21513: Speedup some properties of IP addresses (IPv4Address,
  IPv6Address) such as .is_private or .is_multicast.

* bpo-21137: Improve the repr for threading.Lock() and its variants
  by showing the "locked" or "unlocked" status.  Patch by Berker
  Peksag.

* bpo-21538: The plistlib module now supports loading of binary
  plist files when reference or offset size is not a power of two.

* bpo-21455: Add a default backlog to socket.listen().

* bpo-21525: Most Tkinter methods which accepted tuples now accept
  lists too.

* bpo-22166: With the assistance of a new internal
  _codecs._forget_codec helping function, test_codecs now clears the
  encoding caches to avoid the appearance of a reference leak

* bpo-22236: Tkinter tests now don't reuse default root window.  New
  root window is created for every test class.

* bpo-10744: Fix PEP 3118 format strings on ctypes objects with a
  nontrivial shape.

* bpo-20826: Optimize ipaddress.collapse_addresses().

* bpo-21487: Optimize ipaddress.summarize_address_range() and
  ipaddress.{IPv4Network,IPv6Network}.subnets().

* bpo-21486: Optimize parsing of netmasks in ipaddress.IPv4Network
  and ipaddress.IPv6Network.

* bpo-13916: Disallowed the surrogatepass error handler for non
  UTF-* encodings.

* bpo-20998: Fixed re.fullmatch() of repeated single character
  pattern with ignore case. Original patch by Matthew Barnett.

* bpo-21075: fileinput.FileInput now reads bytes from standard
  stream if binary mode is specified.  Patch by Sam Kimbrel.

* bpo-19775: Add a samefile() method to pathlib Path objects.
  Initial patch by Vajrasky Kok.

* bpo-21226: Set up modules properly in
  PyImport_ExecCodeModuleObject (and friends).

* bpo-21398: Fix a unicode error in the pydoc pager when the
  documentation contains characters not encodable to the stdout
  encoding.

* bpo-16531: ipaddress.IPv4Network and ipaddress.IPv6Network now
  accept an (address, netmask) tuple argument, so as to easily
  construct network objects from existing addresses.

* bpo-21156: importlib.abc.InspectLoader.source_to_code() is now a
  staticmethod.

* bpo-21424: Simplified and optimized heaqp.nlargest() and
  nmsmallest() to make fewer tuple comparisons.

* bpo-21396: Fix TextIOWrapper(..., write_through=True) to not force
  a flush() on the underlying binary stream.  Patch by akira.

* bpo-18314: Unlink now removes junctions on Windows. Patch by Kim
  Gräsman

* bpo-21088: Bugfix for curses.window.addch() regression in 3.4.0.
  In porting to Argument Clinic, the first two arguments were
  reversed.

* bpo-21407: _decimal: The module now supports function signatures.

* bpo-10650: Remove the non-standard 'watchexp' parameter from the
  Decimal.quantize() method in the Python version.  It had never been
  present in the C version.

* bpo-21469: Reduced the risk of false positives in robotparser by
  checking to make sure that robots.txt has been read or does not
  exist prior to returning True in can_fetch().

* bpo-19414: Have the OrderedDict mark deleted links as unusable.
  This gives an early failure if the link is deleted during iteration.

* bpo-21421: Add __slots__ to the MappingViews ABC. Patch by Josh
  Rosenberg.

* bpo-21101: Eliminate double hashing in the C speed-up code for
  collections.Counter().

* bpo-21321: itertools.islice() now releases the reference to the
  source iterator when the slice is exhausted.  Patch by Anton
  Afanasyev.

* bpo-21057: TextIOWrapper now allows the underlying binary stream's
  read() or read1() method to return an arbitrary bytes-like object
  (such as a memoryview). Patch by Nikolaus Rath.

* bpo-20951: SSLSocket.send() now raises either SSLWantReadError or
  SSLWantWriteError on a non-blocking socket if the operation would
  block. Previously, it would return 0.  Patch by Nikolaus Rath.

* bpo-13248: removed previously deprecated asyncore.dispatcher
  __getattr__ cheap inheritance hack.

* bpo-9815: assertRaises now tries to clear references to local
  variables in the exception's traceback.

* bpo-19940: ssl.cert_time_to_seconds() now interprets the given
  time string in the UTC timezone (as specified in RFC 5280), not the
  local timezone.

* bpo-13204: Calling sys.flags.__new__ would crash the interpreter,
  now it raises a TypeError.

* bpo-19385: Make operations on a closed dbm.dumb database always
  raise the same exception.

* bpo-21207: Detect when the os.urandom cached fd has been closed or
  replaced, and open it anew.

* bpo-21291: subprocess's Popen.wait() is now thread safe so that
  multiple threads may be calling wait() or poll() on a Popen instance
  at the same time without losing the Popen.returncode value.

* bpo-21127: Path objects can now be instantiated from str subclass
  instances (such as "numpy.str_").

* bpo-15002: urllib.response object to use _TemporaryFileWrapper
  (and _TemporaryFileCloser) facility. Provides a better way to handle
  file descriptor close. Patch contributed by Christian Theune.

* bpo-12220: mindom now raises a custom ValueError indicating it
  doesn't support spaces in URIs instead of letting a 'split'
  ValueError bubble up.

* bpo-21068: The ssl.PROTOCOL* constants are now enum members.

* bpo-21276: posixmodule: Don't define USE_XATTRS on KFreeBSD and
  the Hurd.

* bpo-21262: New method assert_not_called for Mock. It raises
  AssertionError if the mock has been called.

* bpo-21238: New keyword argument "unsafe" to Mock. It raises
  "AttributeError" incase of an attribute startswith assert or assret.

* bpo-20896: ssl.get_server_certificate() now uses PROTOCOL_SSLv23,
  not PROTOCOL_SSLv3, for maximum compatibility.

* bpo-21239: patch.stopall() didn't work deterministically when the
  same name was patched more than once.

* bpo-21203: Updated fileConfig and dictConfig to remove
  inconsistencies. Thanks to Jure Koren for the patch.

* bpo-21222: Passing name keyword argument to mock.create_autospec
  now works.

* bpo-21197: Add lib64 -> lib symlink in venvs on 64-bit non-OS X
  POSIX.

* bpo-17498: Some SMTP servers disconnect after certain errors,
  violating strict RFC conformance.  Instead of losing the error code
  when we issue the subsequent RSET, smtplib now returns the error
  code and defers raising the SMTPServerDisconnected error until the
  next command is issued.

* bpo-17826: setting an iterable side_effect on a mock function
  created by create_autospec now works. Patch by Kushal Das.

* bpo-7776: Fix "Host:" header and reconnection when using
  http.client.HTTPConnection.set_tunnel(). Patch by Nikolaus Rath.

* bpo-20968: unittest.mock.MagicMock now supports division. Patch by
  Johannes Baiter.

* bpo-21529: Fix arbitrary memory access in JSONDecoder.raw_decode
  with a negative second parameter. Bug reported by Guido Vranken.
  (See also: CVE-2014-4616)

* bpo-21169: getpass now handles non-ascii characters that the input
  stream encoding cannot encode by re-encoding using the replace error
  handler.

* bpo-21171: Fixed undocumented filter API of the rot13 codec. Patch
  by Berker Peksag.

* bpo-20539: Improved math.factorial error message for large
  positive inputs and changed exception type (OverflowError ->
  ValueError) for large negative inputs.

* bpo-21172: isinstance check relaxed from dict to
  collections.Mapping.

* bpo-21155: asyncio.EventLoop.create_unix_server() now raises a
  ValueError if path and sock are specified at the same time.

* bpo-21136: Avoid unnecessary normalization of Fractions resulting
  from power and other operations.  Patch by Raymond Hettinger.

* bpo-17621: Introduce importlib.util.LazyLoader.

* bpo-21076: signal module constants were turned into enums. Patch
  by Giampaolo Rodola'.

* bpo-20636: Improved the repr of Tkinter widgets.

* bpo-19505: The items, keys, and values views of OrderedDict now
  support reverse iteration using reversed().

* bpo-21149: Improved thread-safety in logging cleanup during
  interpreter shutdown. Thanks to Devin Jeanpierre for the patch.

* bpo-21058: Fix a leak of file descriptor in
  "tempfile.NamedTemporaryFile()", close the file descriptor if
  "io.open()" fails

* bpo-21200: Return None from pkgutil.get_loader() when __spec__ is
  missing.

* bpo-21013: Enhance ssl.create_default_context() when used for
  server side sockets to provide better security by default.

* bpo-20145: "assertRaisesRegex" and "assertWarnsRegex" now raise a
  TypeError if the second argument is not a string or compiled regex.

* bpo-20633: Replace relative import by absolute import.

* bpo-20980: Stop wrapping exception when using ThreadPool.

* bpo-21082: In os.makedirs, do not set the process-wide umask. Note
  this changes behavior of makedirs when exist_ok=True.

* bpo-20990: Fix issues found by pyflakes for multiprocessing.

* bpo-21015: SSL contexts will now automatically select an elliptic
  curve for ECDH key exchange on OpenSSL 1.0.2 and later, and
  otherwise default to "prime256v1".

* bpo-21000: Improve the command-line interface of json.tool.

* bpo-20995: Enhance default ciphers used by the ssl module to
  enable better security and prioritize perfect forward secrecy.

* bpo-20884: Don't assume that __file__ is defined on
  importlib.__init__.

* bpo-21499: Ignore __builtins__ in several test_importlib.test_api
  tests.

* bpo-20627: xmlrpc.client.ServerProxy is now a context manager.

* bpo-19165: The formatter module now raises DeprecationWarning
  instead of PendingDeprecationWarning.

* bpo-13936: Remove the ability of datetime.time instances to be
  considered false in boolean contexts.

* bpo-18931: selectors module now supports /dev/poll on Solaris.
  Patch by Giampaolo Rodola'.

* bpo-19977: When the "LC_TYPE" locale is the POSIX locale ("C"
  locale), "sys.stdin" and "sys.stdout" are now using the
  "surrogateescape" error handler, instead of the "strict" error
  handler.

* bpo-20574: Implement incremental decoder for cp65001 code (Windows
  code page 65001, Microsoft UTF-8).

* bpo-20879: Delay the initialization of encoding and decoding
  tables for base32, ascii85 and base85 codecs in the base64 module,
  and delay the initialization of the unquote_to_bytes() table of the
  urllib.parse module, to not waste memory if these modules are not
  used.

* bpo-19157: Include the broadcast address in the usuable hosts for
  IPv6 in ipaddress.

* bpo-11599: When an external command (e.g. compiler) fails,
  distutils now prints out the whole command line (instead of just the
  command name) if the environment variable DISTUTILS_DEBUG is set.

* bpo-4931: distutils should not produce unhelpful "error: None"
  messages anymore. distutils.util.grok_environment_error is kept but
  doc-deprecated.

* bpo-20875: Prevent possible gzip "'read' is not defined"
  NameError. Patch by Claudiu Popa.

* bpo-11558: "email.message.Message.attach" now returns a more
  useful error message if "attach" is called on a message for which
  "is_multipart" is False.

* bpo-20283: RE pattern methods now accept the string keyword
  parameters as documented. The pattern and source keyword parameters
  are left as deprecated aliases.

* bpo-20778: Fix modulefinder to work with bytecode-only modules.

* bpo-20791: copy.copy() now doesn't make a copy when the input is a
  bytes object. Initial patch by Peter Otten.

* bpo-19748: On AIX, time.mktime() now raises an OverflowError for
  year outsize range [1902; 2037].

* bpo-19573: inspect.signature: Use enum for parameter kind
  constants.

* bpo-20726: inspect.signature: Make Signature and Parameter
  picklable.

* bpo-17373: Add inspect.Signature.from_callable method.

* bpo-20378: Improve repr of inspect.Signature and
  inspect.Parameter.

* bpo-20816: Fix inspect.getcallargs() to raise correct TypeError
  for missing keyword- only arguments. Patch by Jeremiah Lowin.

* bpo-20817: Fix inspect.getcallargs() to fail correctly if more
  than 3 arguments are missing. Patch by Jeremiah Lowin.

* bpo-6676: Ensure a meaningful exception is raised when attempting
  to parse more than one XML document per pyexpat xmlparser instance.
  (Original patches by Hirokazu Yamamoto and Amaury Forgeot d'Arc,
  with suggested wording by David Gutteridge)

* bpo-21117: Fix inspect.signature to better support
  functools.partial. Due to the specifics of functools.partial
  implementation, positional-or-keyword arguments passed as keyword
  arguments become keyword-only.

* bpo-20334: inspect.Signature and inspect.Parameter are now
  hashable. Thanks to Antony Lee for bug reports and suggestions.

* bpo-15916: doctest.DocTestSuite returns an empty
  unittest.TestSuite instead of raising ValueError if it finds no
  tests

* bpo-21209: Fix asyncio.tasks.CoroWrapper to workaround a bug in
  yield-from implementation in CPythons prior to 3.4.1.

* asyncio: Add gi_{frame,running,code} properties to CoroWrapper
  (upstream bpo-163).

* bpo-21311: Avoid exception in _osx_support with non-standard
  compiler configurations. Patch by John Szakmeister.

* bpo-11571: Ensure that the turtle window becomes the topmost
  window when launched on OS X.

* bpo-21801: Validate that __signature__ is None or an instance of
  Signature.

* bpo-21923: Prevent AttributeError in
  distutils.sysconfig.customize_compiler due to possible uninitialized
  _config_vars.

* bpo-21323: Fix http.server to again handle scripts in CGI
  subdirectories, broken by the fix for security bpo-19435.  Patch by
  Zach Byrne.

* bpo-22733: Fix ffi_prep_args not zero-extending argument values
  correctly on 64-bit Windows.

* bpo-23302: Default to TCP_NODELAY=1 upon establishing an
  HTTPConnection. Removed use of hard-coded MSS as it's an
  optimization that's no longer needed with Nagle disabled.


IDLE
----

* bpo-20577: Configuration of the max line length for the
  FormatParagraph extension has been moved from the General tab of the
  Idle preferences dialog to the FormatParagraph tab of the Config
  Extensions dialog. Patch by Tal Einat.

* bpo-16893: Update Idle doc chapter to match current Idle and add
  new information.

* bpo-3068: Add Idle extension configuration dialog to Options menu.
  Changes are written to HOME/.idlerc/config-extensions.cfg. Original
  patch by Tal Einat.

* bpo-16233: A module browser (File : Class Browser, Alt+C) requires
  an editor window with a filename.  When Class Browser is requested
  otherwise, from a shell, output window, or 'Untitled' editor, Idle
  no longer displays an error box. It now pops up an Open Module box
  (Alt+M). If a valid name is entered and a module is opened, a
  corresponding browser is also opened.

* bpo-4832: Save As to type Python files automatically adds .py to
  the name you enter (even if your system does not display it).  Some
  systems automatically add .txt when type is Text files.

* bpo-21986: Code objects are not normally pickled by the pickle
  module. To match this, they are no longer pickled when running under
  Idle.

* bpo-17390: Adjust Editor window title; remove 'Python', move
  version to end.

* bpo-14105: Idle debugger breakpoints no longer disappear when
  inserting or deleting lines.

* bpo-17172: Turtledemo can now be run from Idle. Currently, the
  entry is on the Help menu, but it may move to Run. Patch by
  Ramchandra Apt and Lita Cho.

* bpo-21765: Add support for non-ascii identifiers to HyperParser.

* bpo-21940: Add unittest for WidgetRedirector. Initial patch by
  Saimadhav Heblikar.

* bpo-18592: Add unittest for SearchDialogBase. Patch by Phil
  Webster.

* bpo-21694: Add unittest for ParenMatch. Patch by Saimadhav
  Heblikar.

* bpo-21686: add unittest for HyperParser. Original patch by
  Saimadhav Heblikar.

* bpo-12387: Add missing upper(lower)case versions of default
  Windows key bindings for Idle so Caps Lock does not disable them.
  Patch by Roger Serwy.

* bpo-21695: Closing a Find-in-files output window while the search
  is still in progress no longer closes Idle.

* bpo-18910: Add unittest for textView. Patch by Phil Webster.

* bpo-18292: Add unittest for AutoExpand. Patch by Saihadhav
  Heblikar.

* bpo-18409: Add unittest for AutoComplete. Patch by Phil Webster.

* bpo-21477: htest.py - Improve framework, complete set of tests.
  Patches by Saimadhav Heblikar

* bpo-18104: Add idlelib/idle_test/htest.py with a few sample tests
  to begin consolidating and improving human-validated tests of Idle.
  Change other files as needed to work with htest.  Running the module
  as __main__ runs all tests.

* bpo-21139: Change default paragraph width to 72, the PEP 8
  recommendation.

* bpo-21284: Paragraph reformat test passes after user changes
  reformat width.

* bpo-17654: Ensure IDLE menus are customized properly on OS X for
  non-framework builds and for all variants of Tk.

* bpo-23180: Rename IDLE "Windows" menu item to "Window". Patch by
  Al Sweigart.


Build
-----

* bpo-15506: Use standard PKG_PROG_PKG_CONFIG autoconf macro in the
  configure script.

* bpo-22935: Allow the ssl module to be compiled if openssl doesn't
  support SSL 3.

* bpo-22592: Drop support of the Borland C compiler to build Python.
  The distutils module still supports it to build extensions.

* bpo-22591: Drop support of MS-DOS, especially of the DJGPP
  compiler (MS-DOS port of GCC).

* bpo-16537: Check whether self.extensions is empty in setup.py.
  Patch by Jonathan Hosmer.

* bpo-22359: Remove incorrect uses of recursive make.  Patch by
  Jonas Wagner.

* bpo-21958: Define HAVE_ROUND when building with Visual Studio 2013
  and above.  Patch by Zachary Turner.

* bpo-18093: the programs that embed the CPython runtime are now in
  a separate "Programs" directory, rather than being kept in the
  Modules directory.

* bpo-15759: "make suspicious", "make linkcheck" and "make doctest"
  in Doc/ now display special message when and only when there are
  failures.

* bpo-21141: The Windows build process no longer attempts to find
  Perl, instead relying on OpenSSL source being configured and ready
  to build. The "PCbuild\build_ssl.py" script has been re-written and
  re-named to "PCbuild\prepare_ssl.py", and takes care of configuring
  OpenSSL source for both 32 and 64 bit platforms.  OpenSSL sources
  obtained from svn.python.org will always be pre-configured and ready
  to build.

* bpo-21037: Add a build option to enable AddressSanitizer support.

* bpo-19962: The Windows build process now creates "python.bat" in
  the root of the source tree, which passes all arguments through to
  the most recently built interpreter.

* bpo-21285: Refactor and fix curses configure check to always
  search in a ncursesw directory.

* bpo-15234: For BerkelyDB and Sqlite, only add the found library
  and include directories if they aren't already being searched. This
  avoids an explicit runtime library dependency.

* bpo-17861: Tools/scripts/generate_opcode_h.py automatically
  regenerates Include/opcode.h from Lib/opcode.py if the latter gets
  any change.

* bpo-20644: OS X installer build support for documentation build
  changes in 3.4.1: assume externally supplied sphinx-build is
  available in /usr/bin.

* bpo-20022: Eliminate use of deprecated bundlebuilder in OS X
  builds.

* bpo-15968: Incorporated Tcl, Tk, and Tix builds into the Windows
  build solution.

* bpo-17095: Fix Modules/Setup *shared* support.

* bpo-21811: Anticipated fixes to support OS X versions > 10.9.

* bpo-21166: Prevent possible segfaults and other random failures of
  python --generate- posix-vars in pybuilddir.txt build target.

* bpo-18096: Fix library order returned by python-config.

* bpo-17219: Add library build dir for Python extension cross-
  builds.

* bpo-22919: Windows build updated to support VC 14.0 (Visual Studio
  2015), which will be used for the official release.

* bpo-21236: Build _msi.pyd with cabinet.lib instead of fci.lib

* bpo-17128: Use private version of OpenSSL for OS X 10.5+
  installer.


C API
-----

* bpo-14203: Remove obsolete support for view==NULL in
  PyBuffer_FillInfo(), bytearray_getbuffer(), bytesiobuf_getbuffer()
  and array_buffer_getbuf(). All functions now raise BufferError in
  that case.

* bpo-22445: PyBuffer_IsContiguous() now implements precise
  contiguity tests, compatible with NumPy's
  NPY_RELAXED_STRIDES_CHECKING compilation flag.  Previously the
  function reported false negatives for corner cases.

* bpo-22079: PyType_Ready() now checks that statically allocated
  type has no dynamically allocated bases.

* bpo-22453: Removed non-documented macro PyObject_REPR().

* bpo-18395: Rename "_Py_char2wchar()" to "Py_DecodeLocale()",
  rename "_Py_wchar2char()" to "Py_EncodeLocale()", and document these
  functions.

* bpo-21233: Add new C functions: PyMem_RawCalloc(), PyMem_Calloc(),
  PyObject_Calloc(), _PyObject_GC_Calloc(). bytes(int) is now using
  "calloc()" instead of "malloc()" for large objects which is faster
  and use less memory.

* bpo-20942: PyImport_ImportFrozenModuleObject() no longer sets
  __file__ to match what importlib does; this affects
  _frozen_importlib as well as any module loaded using
  imp.init_frozen().


Documentation
-------------

* bpo-19548: Update the codecs module documentation to better cover
  the distinction between text encodings and other codecs, together
  with other clarifications. Patch by Martin Panter.

* bpo-22394: Doc/Makefile now supports "make venv PYTHON=../python"
  to create a venv for generating the documentation, e.g., "make html
  PYTHON=venv/bin/python3".

* bpo-21514: The documentation of the json module now refers to new
  JSON RFC 7159 instead of obsoleted RFC 4627.

* bpo-21777: The binary sequence methods on bytes and bytearray are
  now documented explicitly, rather than assuming users will be able
  to derive the expected behaviour from the behaviour of the
  corresponding str methods.

* bpo-6916: undocument deprecated asynchat.fifo class.

* bpo-17386: Expanded functionality of the "Doc/make.bat" script to
  make it much more comparable to "Doc/Makefile".

* bpo-21312: Update the thread_foobar.h template file to include
  newer threading APIs. Patch by Jack McCracken.

* bpo-21043: Remove the recommendation for specific CA organizations
  and to mention the ability to load the OS certificates.

* bpo-20765: Add missing documentation for PurePath.with_name() and
  PurePath.with_suffix().

* bpo-19407: New package installation and distribution guides based
  on the Python Packaging Authority tools. Existing guides have been
  retained as legacy links from the distutils docs, as they still
  contain some required reference material for tool developers that
  isn't recorded anywhere else.

* bpo-19697: Document cases where __main__.__spec__ is None.


Tests
-----

* bpo-18982: Add tests for CLI of the calendar module.

* bpo-19548: Added some additional checks to test_codecs to ensure
  that statements in the updated documentation remain accurate. Patch
  by Martin Panter.

* bpo-22838: All test_re tests now work with unittest test
  discovery.

* bpo-22173: Update lib2to3 tests to use unittest test discovery.

* bpo-16000: Convert test_curses to use unittest.

* bpo-21456: Skip two tests in test_urllib2net.py if _ssl module not
  present. Patch by Remi Pointel.

* bpo-20746: Fix test_pdb to run in refleak mode (-R).  Patch by
  Xavier de Gaye.

* bpo-22060: test_ctypes has been somewhat cleaned up and
  simplified; it now uses unittest test discovery to find its tests.

* bpo-22104: regrtest.py no longer holds a reference to the suite of
  tests loaded from test modules that don't define test_main().

* bpo-22111: Assorted cleanups in test_imaplib.  Patch by Milan
  Oberkirch.

* bpo-22002: Added "load_package_tests" function to test.support and
  used it to implement/augment test discovery in test_asyncio,
  test_email, test_importlib, test_json, and test_tools.

* bpo-21976: Fix test_ssl to accept LibreSSL version strings.
  Thanks to William Orr.

* bpo-21918: Converted test_tools from a module to a package
  containing separate test files for each tested script.

* bpo-9554: Use modern unittest features in test_argparse. Initial
  patch by Denver Coneybeare and Radu Voicilas.

* bpo-20155: Changed HTTP method names in failing tests in
  test_httpservers so that packet filtering software (specifically
  Windows Base Filtering Engine) does not interfere with the
  transaction semantics expected by the tests.

* bpo-19493: Refactored the ctypes test package to skip tests
  explicitly rather than silently.

* bpo-18492: All resources are now allowed when tests are not run by
  regrtest.py.

* bpo-21634: Fix pystone micro-benchmark: use floor division instead
  of true division to benchmark integers instead of floating point
  numbers. Set pystone version to 1.2. Patch written by Lennart
  Regebro.

* bpo-21605: Added tests for Tkinter images.

* bpo-21493: Added test for ntpath.expanduser().  Original patch by
  Claudiu Popa.

* bpo-19925: Added tests for the spwd module. Original patch by
  Vajrasky Kok.

* bpo-21522: Added Tkinter tests for Listbox.itemconfigure(),
  PanedWindow.paneconfigure(), and Menu.entryconfigure().

* bpo-17756: Fix test_code test when run from the installed
  location.

* bpo-17752: Fix distutils tests when run from the installed
  location.

* bpo-18604: Consolidated checks for GUI availability.  All
  platforms now at least check whether Tk can be instantiated when the
  GUI resource is requested.

* bpo-21275: Fix a socket test on KFreeBSD.

* bpo-21223: Pass test_site/test_startup_imports when some of the
  extensions are built as builtins.

* bpo-20635: Added tests for Tk geometry managers.

* Add test case for freeze.

* bpo-20743: Fix a reference leak in test_tcl.

* bpo-21097: Move test_namespace_pkgs into test_importlib.

* bpo-21503: Use test_both() consistently in test_importlib.

* bpo-20939: Avoid various network test failures due to new redirect
  of http://www.python.org/ to https://www.python.org: use
  http://www.example.com instead.

* bpo-20668: asyncio tests no longer rely on tests.txt file. (Patch
  by Vajrasky Kok)

* bpo-21093: Prevent failures of ctypes test_macholib on OS X if a
  copy of libz exists in $HOME/lib or /usr/local/lib.

* bpo-22770: Prevent some Tk segfaults on OS X when running gui
  tests.

* bpo-23211: Workaround test_logging failure on some OS X 10.6
  systems.

* bpo-23345: Prevent test_ssl failures with large OpenSSL patch
  level values (like 0.9.8zc).


Tools/Demos
-----------

* bpo-22314: pydoc now works when the LINES environment variable is
  set.

* bpo-22615: Argument Clinic now supports the "type" argument for
  the int converter. This permits using the int converter with enums
  and typedefs.

* bpo-20076: The makelocalealias.py script no longer ignores UTF-8
  mapping.

* bpo-20079: The makelocalealias.py script now can parse the
  SUPPORTED file from glibc sources and supports command line options
  for source paths.

* bpo-22201: Command-line interface of the zipfile module now
  correctly extracts ZIP files with directory entries.  Patch by Ryan
  Wilson.

* bpo-22120: For functions using an unsigned integer return
  converter, Argument Clinic now generates a cast to that type for the
  comparison to -1 in the generated code.  (This suppresses a
  compilation warning.)

* bpo-18974: Tools/scripts/diff.py now uses argparse instead of
  optparse.

* bpo-21906: Make Tools/scripts/md5sum.py work in Python 3. Patch by
  Zachary Ware.

* bpo-21629: Fix Argument Clinic's "--converters" feature.

* Add support for "yield from" to 2to3.

* Add support for the PEP 465 matrix multiplication operator to
  2to3.

* bpo-16047: Fix module exception list and __file__ handling in
  freeze. Patch by Meador Inge.

* bpo-11824: Consider ABI tags in freeze. Patch by Meador Inge.

* bpo-20535: PYTHONWARNING no longer affects the run_tests.py
  script. Patch by Arfrever Frehtes Taifersar Arahesis.


Windows
-------

* bpo-23260: Update Windows installer

* The bundled version of Tcl/Tk has been updated to 8.6.3.  The most
  visible result of this change is the addition of new native file
  dialogs when running on Windows Vista or newer.  See Tcl/Tk's TIP
  432 for more information.  Also, this version of Tcl/Tk includes
  support for Windows 10.

* bpo-17896: The Windows build scripts now expect external library
  sources to be in "PCbuild\..\externals" rather than "PCbuild\..\..".

* bpo-17717: The Windows build scripts now use a copy of NASM pulled
  from svn.python.org to build OpenSSL.

* bpo-21907: Improved the batch scripts provided for building
  Python.

* bpo-22644: The bundled version of OpenSSL has been updated to
  1.0.1j.

* bpo-10747: Use versioned labels in the Windows start menu. Patch
  by Olive Kilburn.

* bpo-22980: .pyd files with a version and platform tag (for
  example, ".cp35-win32.pyd") will now be loaded in preference to
  those without tags.


Python 3.4.0 final
==================

*Release date: 2014-03-16*


Library
-------

* bpo-20939: Fix test_geturl failure in test_urllibnet due to new
  redirect of http://www.python.org/ to https://www.python.org.


Documentation
-------------

* Merge in all documentation changes since branching 3.4.0rc1.


Python 3.4.0 release candidate 3
================================

*Release date: 2014-03-09*


Core and Builtins
-----------------

* bpo-20786: Fix signatures for dict.__delitem__ and
  property.__delete__ builtins.


Library
-------

* bpo-20839: Don't trigger a DeprecationWarning in the still
  supported pkgutil.get_loader() API when __loader__ isn't set on a
  module (nor when pkgutil.find_loader() is called directly).


Build
-----

* bpo-14512: Launch pydoc -b instead of pydocgui.pyw on Windows.

* bpo-20748: Uninstalling pip does not leave behind the pyc of the
  uninstaller anymore.

* bpo-20568: The Windows installer now installs the unversioned
  "pip" command in addition to the versioned "pip3" and "pip3.4"
  commands.

* bpo-20757: The ensurepip helper for the Windows uninstaller now
  skips uninstalling pip (rather than failing) if the user has updated
  pip to a different version from the one bundled with ensurepip.

* bpo-20465: Update OS X and Windows installer builds to use SQLite
  3.8.3.1.


Python 3.4.0 release candidate 2
================================

*Release date: 2014-02-23*


Core and Builtins
-----------------

* bpo-20625: Parameter names in __annotations__ were not mangled
  properly. Discovered by Jonas Wielicki, patch by Yury Selivanov.

* bpo-20261: In pickle, lookup __getnewargs__ and __getnewargs_ex__
  on the type of the object.

* bpo-20619: Give the AST nodes of keyword-only arguments a column
  and line number.

* bpo-20526: Revert changes of bpo-19466 which introduces a
  regression: don't clear anymore the state of Python threads early
  during the Python shutdown.


Library
-------

* bpo-20710: The pydoc summary line no longer displays the "self"
  parameter for bound methods.

* bpo-20566: Change asyncio.as_completed() to use a Queue, to avoid
  O(N**2) behavior.

* bpo-20704: Implement new debug API in asyncio. Add new methods
  BaseEventLoop.set_debug() and BaseEventLoop.get_debug(). Add support
  for setting 'asyncio.tasks._DEBUG' variable with
  'PYTHONASYNCIODEBUG' environment variable.

* asyncio: Refactoring and fixes: BaseEventLoop.sock_connect()
  raises an error if the address is not resolved; use __slots__ in
  Handle and TimerHandle; as_completed() and wait() raise TypeError if
  the passed list of Futures is a single Future; call_soon() and other
  'call_*()' functions raise TypeError if the passed callback is a
  coroutine function; _ProactorBasePipeTransport uses
  _FlowControlMixin; WriteTransport.set_write_buffer_size() calls
  _maybe_pause_protocol() to consider pausing receiving if the
  watermark limits have changed; fix _check_resolved_address() for
  IPv6 address; and other minor improvements, along with multiple
  documentation updates.

* bpo-20684: Fix inspect.getfullargspec() to not to follow
  __wrapped__ chains. Make its behaviour consistent with bound methods
  first argument. Patch by Nick Coghlan and Yury Selivanov.

* bpo-20681: Add new error handling API in asyncio. New APIs:
  loop.set_exception_handler(), loop.default_exception_handler(), and
  loop.call_exception_handler().

* bpo-20673: Implement support for UNIX Domain Sockets in asyncio.
  New APIs: loop.create_unix_connection(), loop.create_unix_server(),
  streams.open_unix_connection(), and streams.start_unix_server().

* bpo-20616: Add a format() method to tracemalloc.Traceback.

* bpo-19744: the ensurepip installation step now just prints a
  warning to stderr rather than failing outright if SSL/TLS is
  unavailable. This allows local installation of POSIX builds without
  SSL/TLS support.

* bpo-20594: Avoid name clash with the libc function posix_close.


Build
-----

* bpo-20641: Run MSI custom actions (pip installation, pyc
  compilation) with the NoImpersonate flag, to support elevated
  execution (UAC).

* bpo-20221: Removed conflicting (or circular) hypot definition when
  compiled with VS 2010 or above.  Initial patch by Tabrez Mohammed.

* bpo-20609: Restored the ability to build 64-bit Windows binaries
  on 32-bit Windows, which was broken by the change in bpo-19788.


Python 3.4.0 release candidate 1
================================

*Release date: 2014-02-10*


Core and Builtins
-----------------

* bpo-19255: The builtins module is restored to initial value before
  cleaning other modules.  The sys and builtins modules are cleaned
  last.

* bpo-20588: Make Python-ast.c C89 compliant.

* bpo-20437: Fixed 22 potential bugs when deleting object
  references.

* bpo-20500: Displaying an exception at interpreter shutdown no
  longer risks triggering an assertion failure in PyObject_Str.

* bpo-20538: UTF-7 incremental decoder produced inconsistent string
  when input was truncated in BASE64 section.

* bpo-20404: io.TextIOWrapper (and hence the open() builtin) now
  uses the internal codec marking system added for bpo-19619 to throw
  LookupError for known non- text encodings at stream construction
  time. The existing output type checks remain in place to deal with
  unmarked third party codecs.

* bpo-17162: Add PyType_GetSlot.

* bpo-20162: Fix an alignment issue in the siphash24() hash function
  which caused a crash on PowerPC 64-bit (ppc64).


Library
-------

* bpo-20530: The signatures for slot builtins have been updated to
  reflect the fact that they only accept positional-only arguments.

* bpo-20517: Functions in the os module that accept two filenames
  now register both filenames in the exception on failure.

* bpo-20563: The ipaddress module API is now considered stable.

* bpo-14983: email.generator now always adds a line end after each
  MIME boundary marker, instead of doing so only when there is an
  epilogue.  This fixes an RFC compliance bug and solves an issue with
  signed MIME parts.

* bpo-20540: Fix a performance regression (vs. Python 3.2) when
  layering a multiprocessing Connection over a TCP socket.  For small
  payloads, Nagle's algorithm would introduce idle delays before the
  entire transmission of a message.

* bpo-16983: the new email header parsing code will now decode
  encoded words that are (incorrectly) surrounded by quotes, and
  register a defect.

* bpo-19772: email.generator no longer mutates the message object
  when doing a down- transform from 8bit to 7bit CTEs.

* bpo-20536: the statistics module now correctly handle Decimal
  instances with positive exponents

* bpo-18805: the netmask/hostmask parsing in ipaddress now more
  reliably filters out illegal values and correctly allows any valid
  prefix length.

* bpo-20481: For at least Python 3.4, the statistics module will
  require that all inputs for a single operation be of a single
  consistent type, or else a mixed of ints and a single other
  consistent type. This avoids some interoperability issues that arose
  with the previous approach of coercing to a suitable common type.

* bpo-20478: the statistics module now treats collections.Counter
  inputs like any other iterable.

* bpo-17369: get_filename was raising an exception if the filename
  parameter's RFC2231 encoding was broken in certain ways.  This was a
  regression relative to python2.

* bpo-20013: Some imap servers disconnect if the current mailbox is
  deleted, and imaplib did not handle that case gracefully.  Now it
  handles the 'bye' correctly.

* bpo-20531: Revert 3.4 version of fix for #19063, and apply the 3.3
  version.  That is, do *not* raise an error if unicode is passed to
  email.message.Message.set_payload.

* bpo-20476: If a non-compat32 policy is used with any of the email
  parsers, EmailMessage is now used as the factory class.  The factory
  class should really come from the policy; that will get fixed in
  3.5.

* bpo-19920: TarFile.list() no longer fails when outputs a listing
  containing non- encodable characters.  Based on patch by Vajrasky
  Kok.

* bpo-20515: Fix NULL pointer dereference introduced by bpo-20368.

* bpo-19186: Restore namespacing of expat symbols inside the pyexpat
  module.

* bpo-20053: ensurepip (and hence venv) are no longer affected by
  the settings in the default pip configuration file.

* bpo-20426: When passing the re.DEBUG flag, re.compile() displays
  the debug output every time it is called, regardless of the
  compilation cache.

* bpo-20368: The null character now correctly passed from Tcl to
  Python. Improved error handling in variables-related commands.

* bpo-20435: Fix _pyio.StringIO.getvalue() to take into account
  newline translation settings.

* tracemalloc: Fix slicing traces and fix slicing a traceback.

* bpo-20354: Fix an alignment issue in the tracemalloc module on
  64-bit platforms. Bug seen on 64-bit Linux when using "make profile-
  opt".

* bpo-17159: inspect.signature now accepts duck types of functions,
  which adds support for Cython functions. Initial patch by Stefan
  Behnel.

* bpo-18801: Fix inspect.classify_class_attrs to correctly classify
  object.__new__ and object.__init__.

* Fixed cmath.isinf's name in its argument parsing code.

* bpo-20311: poll and epoll now round the timeout away from zero,
  instead of rounding towards zero, in select and selectors modules:
  select.epoll.poll(), selectors.PollSelector.poll() and
  selectors.EpollSelector.poll(). For example, a timeout of one
  microsecond (1e-6) is now rounded to one millisecondi (1e-3),
  instead of being rounded to zero.  However, the granularity property
  and asyncio's resolution feature were removed again. (See also:
  bpo-20452)

* asyncio: Some refactoring; various fixes; add write flow control
  to unix pipes; Future.set_exception() instantiates the exception
  argument if it is a class; improved proactor pipe transport; support
  wait_for(f, None); don't log broken/disconnected pipes; use
  ValueError instead of assert for forbidden subprocess_{shell,exec}
  arguments; added a convenience API for subprocess management; added
  StreamReader.at_eof(); properly handle duplicate coroutines/futures
  in gather(), wait(), as_completed(); use a bytearray for buffering
  in StreamReader; and more.

* bpo-20288: fix handling of invalid numeric charrefs in HTMLParser.

* bpo-20424: Python implementation of io.StringIO now supports lone
  surrogates.

* bpo-20308: inspect.signature now works on classes without user-
  defined __init__ or __new__ methods.

* bpo-20372: inspect.getfile (and a bunch of other inspect functions
  that use it) doesn't crash with unexpected AttributeError on classes
  defined in C without __module__.

* bpo-20356: inspect.signature formatting uses '/' to separate
  positional-only parameters from others.

* bpo-20223: inspect.signature now supports methods defined with
  functools.partialmethods.

* bpo-19456: ntpath.join() now joins relative paths correctly when a
  drive is present.

* bpo-19077: tempfile.TemporaryDirectory cleanup no longer fails
  when called during shutdown.  Emitting resource warning in __del__
  no longer fails. Original patch by Antoine Pitrou.

* bpo-20394: Silence Coverity warning in audioop module.

* bpo-20367: Fix behavior of concurrent.futures.as_completed() for
  duplicate arguments. Patch by Glenn Langford.

* bpo-8260: The read(), readline() and readlines() methods of
  codecs.StreamReader returned incomplete data when were called after
  readline() or read(size). Based on patch by Amaury Forgeot d'Arc.

* bpo-20105: the codec exception chaining now correctly sets the
  traceback of the original exception as its __traceback__ attribute.

* bpo-17481: inspect.getfullargspec() now uses inspect.signature()
  API.

* bpo-15304: concurrent.futures.wait() can block forever even if
  Futures have completed. Patch by Glenn Langford.

* bpo-14455: plistlib: fix serializing integers in the range of an
  unsigned long long but outside of the range of signed long long for
  binary plist files.


IDLE
----

* bpo-20406: Use Python application icons for Idle window title
  bars. Patch mostly by Serhiy Storchaka.

* Update the python.gif icon for the Idle classbrowser and
  pathbowser from the old green snake to the new blue and yellow
  snakes.

* bpo-17721: Remove non-functional configuration dialog help button
  until we make it actually gives some help when clicked. Patch by
  Guilherme Simões.


Tests
-----

* bpo-20532: Tests which use _testcapi now are marked as CPython
  only.

* bpo-19920: Added tests for TarFile.list().  Based on patch by
  Vajrasky Kok.

* bpo-19990: Added tests for the imghdr module.  Based on patch by
  Claudiu Popa.

* bpo-20474: Fix test_socket "unexpected success" failures on OS X
  10.7+.


Tools/Demos
-----------

* bpo-20530: Argument Clinic's signature format has been revised
  again. The new syntax is highly human readable while still
  preventing false positives.  The syntax also extends Python syntax
  to denote "self" and positional-only parameters, allowing
  inspect.Signature objects to be totally accurate for all supported
  builtins in Python 3.4.

* bpo-20456: Argument Clinic now observes the C preprocessor
  conditional compilation statements of the C files it parses.  When a
  Clinic block is inside a conditional code, it adjusts its output to
  match, including automatically generating an empty methoddef macro.

* bpo-20456: Cloned functions in Argument Clinic now use the correct
  name, not the name of the function they were cloned from, for text
  strings inside generated code.

* bpo-20456: Fixed Argument Clinic's test suite and "--converters"
  feature.

* bpo-20456: Argument Clinic now allows specifying different names
  for a parameter in Python and C, using "as" on the parameter line.

* bpo-20326: Argument Clinic now uses a simple, unique signature to
  annotate text signatures in docstrings, resulting in fewer false
  positives.  "self" parameters are also explicitly marked, allowing
  inspect.Signature() to authoritatively detect (and skip) said
  parameters.

* bpo-20326: Argument Clinic now generates separate checksums for
  the input and output sections of the block, allowing external tools
  to verify that the input has not changed (and thus the output is not
  out-of-date).


Build
-----

* bpo-20465: Update SQLite shipped with OS X installer to 3.8.3.


C API
-----

* bpo-20517: Added new functions allowing OSError exceptions to
  reference two filenames instead of one:
  PyErr_SetFromErrnoWithFilenameObjects() and
  PyErr_SetExcFromWindowsErrWithFilenameObjects().


Documentation
-------------

* bpo-20488: Change wording to say importlib is *the* implementation
  of import instead of just *an* implementation.

* bpo-6386: Clarify in the tutorial that specifying a symlink to
  execute means the directory containing the executed script and not
  the symlink is added to sys.path.


Python 3.4.0 beta 3
===================

*Release date: 2014-01-26*


Core and Builtins
-----------------

* bpo-20189: Four additional builtin types (PyTypeObject,
  PyMethodDescr_Type, _PyMethodWrapper_Type, and PyWrapperDescr_Type)
  have been modified to provide introspection information for
  builtins.

* bpo-17825: Cursor "^" is correctly positioned for SyntaxError and
  IndentationError.

* bpo-2382: SyntaxError cursor "^" is now written at correct
  position in most cases when multibyte characters are in line (before
  "^"). This still not works correctly with wide East Asian
  characters.

* bpo-18960: The first line of Python script could be executed twice
  when the source encoding was specified on the second line.  Now the
  source encoding declaration on the second line isn't effective if
  the first line contains anything except a comment.  'python -x'
  works now again with files with the source encoding declarations,
  and can be used to make Python batch files on Windows.


Library
-------

* asyncio: Various improvements and small changes not all covered by
  issues listed below.  E.g. wait_for() now cancels the inner task if
  the timeout occcurs; tweaked the set of exported symbols; renamed
  Empty/Full to QueueEmpty/QueueFull; "with (yield from lock)" now
  uses a separate context manager; readexactly() raises if not enough
  data was read; PTY support tweaks.

* bpo-20311: asyncio: Add a granularity attribute to BaseEventLoop:
  maximum between the resolution of the BaseEventLoop.time() method
  and the resolution of the selector. The granuarility is used in the
  scheduler to round time and deadline.

* bpo-20311: selectors: Add a resolution attribute to BaseSelector.

* bpo-20189: unittest.mock now no longer assumes that any object for
  which it could get an inspect.Signature is a callable written in
  Python. Fix courtesy of Michael Foord.

* bpo-20317: ExitStack.__exit__ could create a self-referential loop
  if an exception raised by a cleanup operation already had its
  context set correctly (for example, by the @contextmanager
  decorator). The infinite loop this caused is now avoided by checking
  if the expected context is already set before trying to fix it.

* bpo-20374: Fix build with GNU readline >= 6.3.

* bpo-20262: Warnings are raised now when duplicate names are added
  in the ZIP file or too long ZIP file comment is truncated.

* bpo-20165: The unittest module no longer considers tests marked
  with @expectedFailure successful if they pass.

* bpo-18574: Added missing newline in 100-Continue reply from
  http.server.BaseHTTPRequestHandler. Patch by Nikolaus Rath.

* bpo-20270: urllib.urlparse now supports empty ports.

* bpo-20243: TarFile no longer raise ReadError when opened in write
  mode.

* bpo-20238: TarFile opened with external fileobj and "w:gz" mode
  didn't write complete output on close.

* bpo-20245: The open functions in the tarfile module now correctly
  handle empty mode.

* bpo-20242: Fixed basicConfig() format strings for the alternative
  formatting styles. Thanks to kespindler for the bug report and
  patch.

* bpo-20246: Fix buffer overflow in socket.recvfrom_into.

* bpo-20206: Fix edge case in email.quoprimime.encode where it
  truncated lines ending in a character needing encoding but no
  newline by using a more efficient algorithm that doesn't have the
  bug. (See also: bpo-5803)

* bpo-19082: Working xmlrpc.server and xmlrpc.client examples. Both
  in modules and in documentation. Initial patch contributed by
  Vajrasky Kok.

* bpo-20138: The wsgiref.application_uri() and wsgiref.request_uri()
  functions now conform to PEP 3333 when handle non-ASCII URLs.

* bpo-19097: Raise the correct Exception when cgi.FieldStorage is
  given an invalid fileobj.

* bpo-20152: Ported Python/import.c over to Argument Clinic.

* bpo-13107: argparse and optparse no longer raises an exception
  when output a help on environment with too small COLUMNS.  Based on
  patch by Elazar Gershuni.

* bpo-20207: Always disable SSLv2 except when PROTOCOL_SSLv2 is
  explicitly asked for.

* bpo-18960: The tokenize module now ignore the source encoding
  declaration on the second line if the first line contains anything
  except a comment.

* bpo-20078: Reading malformed zipfiles no longer hangs with 100%
  CPU consumption.

* bpo-20113: os.readv() and os.writev() now raise an OSError
  exception on error instead of returning -1.

* bpo-19719: Make importlib.abc.MetaPathFinder.find_module(),
  PathEntryFinder.find_loader(), and Loader.load_module() use PEP 451
  APIs to help with backwards-compatibility.

* bpo-20144: inspect.Signature now supports parsing simple symbolic
  constants as parameter default values in __text_signature__.

* bpo-20072: Fixed multiple errors in tkinter with wantobjects is
  False.

* bpo-20229: Avoid plistlib deprecation warning in
  platform.mac_ver().

* bpo-14455: Fix some problems with the new binary plist support in
  plistlib.


IDLE
----

* bpo-17390: Add Python version to Idle editor window title bar.
  Original patches by Edmond Burnett and Kent Johnson.

* bpo-18960: IDLE now ignores the source encoding declaration on the
  second line if the first line contains anything except a comment.


Tests
-----

* bpo-20358: Tests for curses.window.overlay and
  curses.window.overwrite no longer specify min{row,col} >
  max{row,col}.

* bpo-19804: The test_find_mac test in test_uuid is now skipped if
  the ifconfig executable is not available.

* bpo-19886: Use better estimated memory requirements for bigmem
  tests.


Tools/Demos
-----------

* bpo-20390: Argument Clinic's "file" output preset now defaults to
  "{dirname}/clinic/{basename}.h".

* bpo-20390: Argument Clinic's "class" directive syntax has been
  extended with two new required arguments: "typedef" and
  "type_object".

* bpo-20390: Argument Clinic: If __new__ or __init__ functions
  didn't use kwargs (or args), the PyArg_NoKeywords (or
  PyArg_NoPositional) calls generated are only run when the type
  object is an exact match.

* bpo-20390: Argument Clinic now fails if you have required
  parameters after optional parameters.

* bpo-20390: Argument Clinic converters now have a new template they
  can inject code into: "modifiers".  Code put there is run in the
  parsing function after argument parsing but before the call to the
  impl.

* bpo-20376: Argument Clinic now escapes backslashes in docstrings.

* bpo-20381: Argument Clinic now sanity checks the default argument
  when c_default is also specified, providing a nice failure message
  for disallowed values.

* bpo-20189: Argument Clinic now ensures that parser functions for
  __new__ are always of type newfunc, the type of the tp_new slot.
  Similarly, parser functions for __init__ are now always of type
  initproc, the type of tp_init.

* bpo-20189: Argument Clinic now suppresses the docstring for
  __new__ and __init__ functions if no docstring is provided in the
  input.

* bpo-20189: Argument Clinic now suppresses the "self" parameter in
  the impl for @staticmethod functions.

* bpo-20294: Argument Clinic now supports argument parsing for
  __new__ and __init__ functions.

* bpo-20299: Argument Clinic custom converters may now change the
  default value of c_default and py_default with a class member.

* bpo-20287: Argument Clinic's output is now configurable, allowing
  delaying its output or even redirecting it to a separate file.

* bpo-20226: Argument Clinic now permits simple expressions (e.g.
  "sys.maxsize - 1") as default values for parameters.

* bpo-19936: Added executable bits or shebang lines to Python
  scripts which requires them.  Disable executable bits and shebang
  lines in test and benchmark files in order to prevent using a random
  system python, and in source files of modules which don't provide
  command line interface.  Fixed shebang lines in the unittestgui and
  checkpip scripts.

* bpo-20268: Argument Clinic now supports cloning the parameters and
  return converter of existing functions.

* bpo-20228: Argument Clinic now has special support for class
  special methods.

* bpo-20214: Fixed a number of small issues and documentation errors
  in Argument Clinic (see issue for details).

* bpo-20196: Fixed a bug where Argument Clinic did not generate
  correct parsing code for functions with positional-only parameters
  where all arguments are optional.

* bpo-18960: 2to3 and the findnocoding.py script now ignore the
  source encoding declaration on the second line if the first line
  contains anything except a comment.

* bpo-19723: The marker comments Argument Clinic uses have been
  changed to improve readability.

* bpo-20157: When Argument Clinic renames a parameter because its
  name collides with a C keyword, it no longer exposes that rename to
  PyArg_Parse.

* bpo-20141: Improved Argument Clinic's support for the PyArg_Parse
  "O!" format unit.

* bpo-20144: Argument Clinic now supports simple symbolic constants
  as parameter default values.

* bpo-20143: The line numbers reported in Argument Clinic errors are
  now more accurate.

* bpo-20142: Py_buffer variables generated by Argument Clinic are
  now initialized with a default value.


Build
-----

* bpo-12837: Silence a tautological comparison warning on OS X under
  Clang in socketmodule.c.


Python 3.4.0 beta 2
===================

*Release date: 2014-01-05*


Core and Builtins
-----------------

* bpo-17432: Drop UCS2 from names of Unicode functions in
  python3.def.

* bpo-19526: Exclude all new API from the stable ABI. Exceptions can
  be made if a need is demonstrated.

* bpo-19969: PyBytes_FromFormatV() now raises an OverflowError if
  "%c" argument is not in range [0; 255].

* bpo-19995: %c, %o, %x, and %X now issue a DeprecationWarning on
  non- integer input; reworded docs to clarify that an integer type
  should define both __int__ and __index__.

* bpo-19787: PyThread_set_key_value() now always set the value. In
  Python 3.3, the function did nothing if the key already exists (if
  the current value is a non-NULL pointer).

* bpo-14432: Remove the thread state field from the frame structure.
  Fix a crash when a generator is created in a C thread that is
  destroyed while the generator is still used. The issue was that a
  generator contains a frame, and the frame kept a reference to the
  Python state of the destroyed C thread. The crash occurs when a
  trace function is setup.

* bpo-19576: PyGILState_Ensure() now initializes threads. At
  startup, Python has no concrete GIL. If PyGILState_Ensure() is
  called from a new thread for the first time and PyEval_InitThreads()
  was not called yet, a GIL needs to be created.

* bpo-17576: Deprecation warning emitted now when __int__() or
  __index__() return not int instance.

* bpo-19932: Fix typo in import.h, missing whitespaces in function
  prototypes.

* bpo-19736: Add module-level statvfs constants defined for
  GNU/glibc based systems.

* bpo-20097: Fix bad use of "self" in importlib's
  WindowsRegistryFinder.

* bpo-19729: In str.format(), fix recursive expansion in format
  spec.

* bpo-19638: Fix possible crash / undefined behaviour from huge
  (more than 2 billion characters) input strings in _Py_dg_strtod.


Library
-------

* bpo-20154: Deadlock in asyncio.StreamReader.readexactly().

* bpo-16113: Remove sha3 module again.

* bpo-20111: pathlib.Path.with_suffix() now sanity checks the given
  suffix.

* Fix breakage in TestSuite.countTestCases() introduced by
  bpo-11798.

* bpo-20108: Avoid parameter name clash in inspect.getcallargs().

* bpo-19918: Fix PurePath.relative_to() under Windows.

* bpo-19422: Explicitly disallow non-SOCK_STREAM sockets in the ssl
  module, rather than silently let them emit clear text data.

* bpo-20046: Locale alias table no longer contains entities which
  can be calculated. Generalized support of the euro modifier.

* bpo-20027: Fixed locale aliases for devanagari locales.

* bpo-20067: Tkinter variables now work when wantobjects is false.

* bpo-19020: Tkinter now uses splitlist() instead of split() in
  configure methods.

* bpo-19744: ensurepip now provides a better error message when
  Python is built without SSL/TLS support (pip currently requires that
  support to run, even if only operating with local wheel files)

* bpo-19734: ensurepip now ignores all pip environment variables to
  avoid odd behaviour based on user configuration settings

* Fix TypeError on "setup.py upload --show-response".

* bpo-20045: Fix "setup.py register --list-classifiers".

* bpo-18879: When a method is looked up on a temporary file, avoid
  closing the file before the method is possibly called.

* bpo-20037: Avoid crashes when opening a text file late at
  interpreter shutdown.

* bpo-19967: Thanks to the PEP 442, asyncio.Future now uses a
  destructor to log uncaught exceptions, instead of the dedicated
  _TracebackLogger class.

* Added a Task.current_task() class method to asyncio.

* bpo-19850: Set SA_RESTART in asyncio when registering a signal
  handler to limit EINTR occurrences.

* Implemented write flow control in asyncio for proactor event loop
  (Windows).

* Change write buffer in asyncio use to avoid O(N**2) behavior.
  Make write()/sendto() accept bytearray/memoryview.

* bpo-20034: Updated alias mapping to most recent locale.alias file
  from X.org distribution using makelocalealias.py.

* bpo-5815: Fixed support for locales with modifiers.  Fixed support
  for locale encodings with hyphens.

* bpo-20026: Fix the sqlite module to handle correctly invalid
  isolation level (wrong type).

* bpo-18829: csv.Dialect() now checks type for delimiter, escapechar
  and quotechar fields.  Original patch by Vajrasky Kok.

* bpo-19855: uuid.getnode() on Unix now looks on the PATH for the
  executables used to find the mac address, with /sbin and /usr/sbin
  as fallbacks.

* bpo-20007: HTTPResponse.read(0) no more prematurely closes
  connection. Original patch by Simon Sapin.

* bpo-19946: multiprocessing now uses runpy to initialize __main__
  in child processes when necessary, allowing it to correctly handle
  scripts without suffixes and submodules that use explicit relative
  imports or otherwise rely on parent modules being correctly imported
  prior to execution.

* bpo-19921: When Path.mkdir() is called with parents=True, any
  missing parent is created with the default permissions, ignoring the
  mode argument (mimicking the POSIX "mkdir -p" command).

* bpo-19887: Improve the Path.resolve() algorithm to support certain
  symlink chains.

* bpo-19912: Fixed numerous bugs in ntpath.splitunc().

* bpo-19911: ntpath.splitdrive() now correctly processes the 'İ'
  character (U+0130, LATIN CAPITAL LETTER I WITH DOT ABOVE).

* bpo-19532: python -m compileall with no filename/directory
  arguments now respects the -f and -q flags instead of ignoring them.

* bpo-19623: Fixed writing to unseekable files in the aifc module.

* bpo-19946: multiprocessing.spawn now raises ImportError when the
  module to be used as the main module cannot be imported.

* bpo-17919: select.poll.register() again works with poll.POLLNVAL
  on AIX. Fixed integer overflow in the eventmask parameter.

* bpo-19063: if a Charset's body_encoding was set to None, the email
  package would generate a message claiming the Content-Transfer-
  Encoding was 7bit, and produce garbage output for the content.  This
  now works. A couple of other set_payload mishandlings of non-ASCII
  are also fixed. In addition, calling set_payload with a string
  argument without specifying a charset now raises an error (this is a
  new error in 3.4).

* bpo-15475: Add __sizeof__ implementations for itertools objects.

* bpo-19944: Fix importlib.find_spec() so it imports parents as
  needed and move the function to importlib.util.

* bpo-19880: Fix a reference leak in unittest.TestCase. Explicitly
  break reference cycles between frames and the _Outcome instance.

* bpo-17429: platform.linux_distribution() now decodes files from
  the UTF-8 encoding with the surrogateescape error handler, instead
  of decoding from the locale encoding in strict mode. It fixes the
  function on Fedora 19 which is probably the first major distribution
  release with a non-ASCII name. Patch written by Toshio Kuratomi.

* bpo-19343: Expose FreeBSD-specific APIs in resource module.
  Original patch by Koobs.

* bpo-19929: Call os.read with 32768 within
  subprocess.Popen.communicate rather than 4096 for efficiency.  A
  microbenchmark shows Linux and OS X both using ~50% less cpu time
  this way.

* bpo-19506: Use a memoryview to avoid a data copy when piping data
  to stdin within subprocess.Popen.communicate.  5-10% less cpu usage.

* bpo-19876: selectors unregister() no longer raises ValueError or
  OSError if the FD is closed (as long as it was registered).

* bpo-19908: pathlib now joins relative Windows paths correctly when
  a drive is present. Original patch by Antoine Pitrou.

* bpo-19296: Silence compiler warning in dbm_open

* bpo-6784: Strings from Python 2 can now be unpickled as bytes
  objects by setting the encoding argument of Unpickler to be 'bytes'.
  Initial patch by Merlijn van Deen.

* bpo-19839: Fix regression in bz2 module's handling of non-bzip2
  data at EOF, and analogous bug in lzma module.

* bpo-19881: Fix pickling bug where cpickle would emit bad pickle
  data for large bytes string (i.e., with size greater than 2**32-1).

* bpo-19138: doctest's IGNORE_EXCEPTION_DETAIL now allows a match
  when no exception detail exists (no colon following the exception's
  name, or a colon does follow but no text follows the colon).

* bpo-19927: Add __eq__ to path-based loaders in importlib.

* bpo-19827: On UNIX, setblocking() and settimeout() methods of
  socket.socket can now avoid a second syscall if the ioctl() function
  can be used, or if the non- blocking flag of the socket is
  unchanged.

* bpo-19785: smtplib now supports SSLContext.check_hostname and
  server name indication for TLS/SSL connections.

* bpo-19784: poplib now supports SSLContext.check_hostname and
  server name indication for TLS/SSL connections.

* bpo-19783: nntplib now supports SSLContext.check_hostname and
  server name indication for TLS/SSL connections.

* bpo-19782: imaplib now supports SSLContext.check_hostname and
  server name indication for TLS/SSL connections.

* bpo-20123: Fix pydoc.synopsis() for "binary" modules.

* bpo-19834: Support unpickling of exceptions pickled by Python 2.

* bpo-19781: ftplib now supports SSLContext.check_hostname and
  server name indication for TLS/SSL connections.

* bpo-19509: Add SSLContext.check_hostname to match the peer's
  certificate with server_hostname on handshake.

* bpo-15798: Fixed subprocess.Popen() to no longer fail if file
  descriptor 0, 1 or 2 is closed.

* bpo-17897: Optimized unpickle prefetching.

* bpo-3693: Make the error message more helpful when the
  array.array() constructor is given a str. Move the array module
  typecode documentation to the docstring of the constructor.

* bpo-19088: Fixed incorrect caching of the copyreg module in
  object.__reduce__() and object.__reduce_ex__().

* bpo-19698: Removed exec_module() methods from
  importlib.machinery.BuiltinImporter and ExtensionFileLoader.

* bpo-18864: Added a setter for ModuleSpec.has_location.

* Fixed _pickle.Unpickler to not fail when loading empty strings as
  persistent IDs.

* bpo-11480: Fixed copy.copy to work with classes with custom
  metaclasses. Patch by Daniel Urban.

* bpo-6477: Added support for pickling the types of built-in
  singletons (i.e., Ellipsis, NotImplemented, None).

* bpo-19713: Add remaining PEP 451-related deprecations and move
  away from using find_module/find_loaer/load_module.

* bpo-19708: Update pkgutil to use the new importer APIs.

* bpo-19703: Update pydoc to use the new importer APIs.

* bpo-19851: Fixed a regression in reloading sub-modules.

* ssl.create_default_context() sets OP_NO_COMPRESSION to prevent
  CRIME.

* bpo-19802: Add socket.SO_PRIORITY.

* bpo-11508: Fixed uuid.getnode() and uuid.uuid1() on environment
  with virtual interface. Original patch by Kent Frazier.

* bpo-11489: JSON decoder now accepts lone surrogates.

* bpo-19545: Avoid chained exceptions while passing stray % to
  time.strptime().  Initial patch by Claudiu Popa.


IDLE
----

* bpo-20058: sys.stdin.readline() in IDLE now always returns only
  one line.

* bpo-19481: print() of string subclass instance in IDLE no longer
  hangs.

* bpo-18270: Prevent possible IDLE AttributeError on OS X when no
  initial shell window is present.


Tests
-----

* bpo-20055: Fix test_shutil under Windows with symlink privileges
  held. Patch by Vajrasky Kok.

* bpo-20070: Don't run test_urllib2net when network resources are
  not enabled.

* bpo-19938: Re-enabled test_bug_1333982 in test_dis, which had been
  disabled since 3.0 due to the changes in listcomp handling.

* bpo-19320: test_tcl no longer fails when wantobjects is false.

* bpo-19919: Fix flaky SSL test. connect_ex() sometimes returns
  EWOULDBLOCK on Windows or VMs hosted on Windows.

* bpo-19912: Added tests for ntpath.splitunc().

* bpo-19828: Fixed test_site when the whole suite is run with -S.

* bpo-19928: Implemented a test for repr() of cell objects.

* bpo-19535: Fixed test_docxmlrpc, test_functools, test_inspect, and
  test_statistics when python is run with -OO.

* bpo-19926: Removed unneeded test_main from test_abstract_numbers.
  Patch by Vajrasky Kok.

* bpo-19572: More skipped tests explicitly marked as skipped.

* bpo-19595: Re-enabled a long-disabled test in test_winsound. (See
  also: bpo-19987)

* bpo-19588: Fixed tests in test_random that were silently skipped
  most of the time. Patch by Julian Gindi.


Build
-----

* bpo-19728: Enable pip installation by default on Windows.

* bpo-16136: Remove VMS support

* bpo-18215: Add script Tools/ssl/test_multiple_versions.py to
  compile and run Python's unit tests with multiple versions of
  OpenSSL.

* bpo-19922: define _INCLUDE__STDC_A1_SOURCE in HP-UX to include
  mbstate_t for mbrtowc().

* bpo-19788: kill_python(_d).exe is now run as a PreBuildEvent on
  the pythoncore sub- project.  This should prevent build errors due a
  previous build's python(_d).exe still running.


Documentation
-------------

* bpo-20265: Updated some parts of the Using Windows document.

* bpo-20266: Updated some parts of the Windows FAQ.

* bpo-20255: Updated the about and bugs pages.

* bpo-20253: Fixed a typo in the ipaddress docs that advertised an
  illegal attribute name.  Found by INADA Naoki.

* bpo-18840: Introduce the json module in the tutorial, and de-
  emphasize the pickle module.

* bpo-19845: Updated the Compiling Python on Windows section.

* bpo-19795: Improved markup of True/False constants.


Tools/Demos
-----------

* bpo-19659: Added documentation for Argument Clinic.

* bpo-19976: Argument Clinic METH_NOARGS functions now always take
  two parameters.


Python 3.4.0 beta 1
===================

*Release date: 2013-11-24*


Core and Builtins
-----------------

* Use the repr of a module name in more places in import, especially
  exceptions.

* bpo-19619: str.encode, bytes.decode and bytearray.decode now use
  an internal API to throw LookupError for known non-text encodings,
  rather than attempting the encoding or decoding operation and then
  throwing a TypeError for an unexpected output type. (The latter
  mechanism remains in place for third party non-text encodings)

* bpo-19183: Implement PEP 456 'secure and interchangeable hash
  algorithm'. Python now uses SipHash24 on all major platforms.

* bpo-12892: The utf-16* and utf-32* encoders no longer allow
  surrogate code points (U+D800-U+DFFF) to be encoded.  The utf-32*
  decoders no longer decode byte sequences that correspond to
  surrogate code points.  The surrogatepass error handler now works
  with the utf-16* and utf-32* codecs. Based on patches by Victor
  Stinner and Kang-Hao (Kenny) Lu.

* bpo-17806: Added keyword-argument support for "tabsize" to
  str/bytes.expandtabs().

* bpo-17828: Output type errors in str.encode(), bytes.decode() and
  bytearray.decode() now direct users to codecs.encode() or
  codecs.decode() as appropriate.

* bpo-17828: The interpreter now attempts to chain errors that occur
  in codec processing with a replacement exception of the same type
  that includes the codec name in the error message. It ensures it
  only does this when the creation of the replacement exception won't
  lose any information.

* bpo-19466: Clear the frames of daemon threads earlier during the
  Python shutdown to call object destructors. So "unclosed file"
  resource warnings are now correctly emitted for daemon threads.

* bpo-19514: Deduplicate some _Py_IDENTIFIER declarations. Patch by
  Andrei Dorian Duma.

* bpo-17936: Fix O(n**2) behaviour when adding or removing many
  subclasses of a given type.

* bpo-19428: zipimport now handles errors when reading truncated or
  invalid ZIP archive.

* bpo-18408: Add a new PyFrame_FastToLocalsWithError() function to
  handle exceptions when merging fast locals into f_locals of a frame.
  PyEval_GetLocals() now raises an exception and return NULL on
  failure.

* bpo-19369: Optimized the usage of __length_hint__().

* bpo-18603: Ensure that PyOS_mystricmp and PyOS_mystrnicmp are in
  the Python executable and not removed by the linker's optimizer.

* bpo-19306: Add extra hints to the faulthandler module's stack
  dumps that these are "upside down".


Library
-------

* bpo-3158: doctest can now find doctests in functions and methods
  written in C.

* bpo-13477: Added command line interface to the tarfile module.
  Original patch by Berker Peksag.

* bpo-19674: inspect.signature() now produces a correct signature
  for some builtins.

* bpo-19722: Added opcode.stack_effect(), which computes the stack
  effect of bytecode instructions.

* bpo-19735: Implement private function ssl._create_stdlib_context()
  to create SSLContext objects in Python's stdlib module. It provides
  a single configuration point and makes use of
  SSLContext.load_default_certs().

* bpo-16203: Add re.fullmatch() function and regex.fullmatch()
  method, which anchor the pattern at both ends of the string to
  match. Original patch by Matthew Barnett.

* bpo-13592: Improved the repr for regular expression pattern
  objects. Based on patch by Hugo Lopes Tavares.

* bpo-19641: Added the audioop.byteswap() function to convert big-
  endian samples to little-endian and vice versa.

* bpo-15204: Deprecated the 'U' mode in file-like objects.

* bpo-17810: Implement PEP 3154, pickle protocol 4.

* bpo-19668: Added support for the cp1125 encoding.

* bpo-19689: Add ssl.create_default_context() factory function. It
  creates a new SSLContext object with secure default settings.

* bpo-19727: os.utime(..., None) is now potentially more precise
  under Windows.

* bpo-17201: ZIP64 extensions now are enabled by default.  Patch by
  William Mallard.

* bpo-19292: Add SSLContext.load_default_certs() to load default
  root CA certificates from default stores or system stores. By
  default the method loads CA certs for authentication of server
  certs.

* bpo-19673: Add pathlib to the stdlib as a provisional module (PEP
  428).

* bpo-16596: pdb in a generator now properly skips over yield and
  yield from rather than stepping out of the generator into its
  caller.  (This is essential for stepping through asyncio
  coroutines.)

* bpo-17916: Added dis.Bytecode.from_traceback() and
  dis.Bytecode.current_offset to easily display "current instruction"
  markers in the new disassembly API (Patch by Claudiu Popa).

* bpo-19552: venv now supports bootstrapping pip into virtual
  environments

* bpo-17134: Finalize interface to Windows' certificate store. Cert
  and CRL enumeration are now two functions. enum_certificates() also
  returns purpose flags as set of OIDs.

* bpo-19555: Restore sysconfig.get_config_var('SO'), (and the
  distutils equivalent) with a DeprecationWarning pointing people at
  $EXT_SUFFIX.

* bpo-8813: Add SSLContext.verify_flags to change the verification
  flags of the context in order to enable certification revocation
  list (CRL) checks or strict X509 rules.

* bpo-18294: Fix the zlib module to make it 64-bit safe.

* bpo-19682: Fix compatibility issue with old version of OpenSSL
  that was introduced by bpo-18379.

* bpo-14455: plistlib now supports binary plists and has an updated
  API.

* bpo-19633: Fixed writing not compressed 16- and 32-bit wave files
  on big-endian platforms.

* bpo-18379: SSLSocket.getpeercert() returns CA issuer AIA fields,
  OCSP and CRL distribution points.

* bpo-18138: Implement cadata argument of
  SSLContext.load_verify_location() to load CA certificates and CRL
  from memory. It supports PEM and DER encoded strings.

* bpo-18775: Add name and block_size attribute to HMAC object. They
  now provide the same API elements as non-keyed cryptographic hash
  functions.

* bpo-17276: MD5 as default digestmod for HMAC is deprecated. The
  HMAC module supports digestmod names, e.g. hmac.HMAC('sha1').

* bpo-19449: in csv's writerow, handle non-string keys when
  generating the error message that certain keys are not in the
  'fieldnames' list.

* bpo-13633: Added a new convert_charrefs keyword arg to HTMLParser
  that, when True, automatically converts all character references.

* bpo-2927: Added the unescape() function to the html module.

* bpo-8402: Added the escape() function to the glob module.

* bpo-17618: Add Base85 and Ascii85 encoding/decoding to the base64
  module.

* bpo-19634: time.strftime("%y") now raises a ValueError on AIX when
  given a year before 1900.

* Fix test.support.bind_port() to not cause an error when Python was
  compiled on a system with SO_REUSEPORT defined in the headers but
  run on a system with an OS kernel that does not support that
  reasonably new socket option.

* Fix compilation error under gcc of the ctypes module bundled
  libffi for arm.

* bpo-19448: Add private API to SSL module to lookup ASN.1 objects
  by OID, NID, short name and long name.

* bpo-19282: dbm.open now supports the context management protocol.
  (Initial patch by Claudiu Popa)

* bpo-8311: Added support for writing any bytes-like objects in the
  aifc, sunau, and wave modules.

* bpo-5202: Added support for unseekable files in the wave module.

* bpo-19544: Restore global option to ignore ~/.pydistutils.cfg in
  Distutils, accidentally removed in backout of distutils2 changes.
  (See also: bpo-1180)

* bpo-19523: Closed FileHandler leak which occurred when delay was
  set.

* bpo-19544: Restore support for --user and --group parameters to
  sdist command accidentally rolled back as part of the distutils2
  rollback. (See also: bpo-6516)

* bpo-13674: Prevented time.strftime from crashing on Windows when
  given a year before 1900 and a format of %y.

* bpo-19406: implementation of the ensurepip module (part of PEP
  453). Patch by Donald Stufft and Nick Coghlan.

* bpo-19544: Restore use of urllib over http allowing use of
  http_proxy for Distutils upload command, a feature accidentally lost
  in the rollback of distutils2. (See also: bpo-6286)

* bpo-19544: Restore the read_pkg_file method to
  distutils.dist.DistributionMetadata accidentally removed in the undo
  of distutils2. (See also: bpo-7457)

* bpo-16685: Added support for any bytes-like objects in the audioop
  module. Removed support for strings.

* bpo-7171: Add Windows implementation of "inet_ntop" and
  "inet_pton" to socket module. Patch by Atsuo Ishimoto.

* bpo-19261: Added support for writing 24-bit samples in the sunau
  module.

* bpo-1097797: Added CP273 encoding, used on IBM mainframes in
  Germany and Austria. Mapping provided by Michael Bierenfeld.

* bpo-1575020: Fixed support of 24-bit wave files on big-endian
  platforms.

* bpo-19378: Fixed a number of cases in the dis module where the new
  "file" parameter was not being honoured correctly

* bpo-19378: Removed the "dis.Bytecode.show_info" method

* bpo-19378: Renamed the "dis.Bytecode.display_code" method to
  "dis.Bytecode.dis" and converted it to returning a string rather
  than printing output.

* bpo-19378: the "line_offset" parameter in the new
  "dis.get_instructions" API has been renamed to "first_line" (and the
  default value and usage changed accordingly). This should reduce
  confusion with the more common use of "offset" in the dis docs to
  refer to bytecode offsets.

* bpo-18678: Corrected spwd struct member names in spwd module:
  sp_nam->sp_namp, and sp_pwd->sp_pwdp.  The old names are kept as
  extra structseq members, for backward compatibility.

* bpo-6157: Fixed tkinter.Text.debug().  tkinter.Text.bbox() now
  raises TypeError instead of TclError on wrong number of arguments.
  Original patch by Guilherme Polo.

* bpo-10197: Rework subprocess.get[status]output to use subprocess
  functionality and thus to work on Windows. Patch by Nick Coghlan

* bpo-6160: The bbox() method of tkinter.Spinbox now returns a tuple
  of integers instead of a string.  Based on patch by Guilherme Polo.

* bpo-19403: contextlib.redirect_stdout is now reentrant

* bpo-19286: Directories in "package_data" are no longer added to
  the filelist, preventing failure outlined in the ticket.

* bpo-19480: HTMLParser now accepts all valid start-tag names as
  defined by the HTML5 standard.

* bpo-15114: The html.parser module now raises a DeprecationWarning
  when the strict argument of HTMLParser or the HTMLParser.error
  method are used.

* bpo-19410: Undo the special-casing removal of '' for
  importlib.machinery.FileFinder.

* bpo-19424: Fix the warnings module to accept filename containing
  surrogate characters.

* bpo-19435: Fix directory traversal attack on
  CGIHttpRequestHandler.

* bpo-19227: Remove pthread_atfork() handler. The handler was added
  to solve #18747 but has caused issues.

* bpo-19420: Fix reference leak in module initialization code of
  _hashopenssl.c

* bpo-19329: Optimized compiling charsets in regular expressions.

* bpo-19227: Try to fix deadlocks caused by re-seeding then OpenSSL
  pseudo-random number generator on fork().

* bpo-16037: HTTPMessage.readheaders() raises an HTTPException when
  more than 100 headers are read.  Adapted from patch by Jyrki
  Pulliainen.

* bpo-16040: CVE-2013-1752: nntplib: Limit maximum line lengths to
  2048 to prevent readline() calls from consuming too much memory.
  Patch by Jyrki Pulliainen.

* bpo-16041: CVE-2013-1752: poplib: Limit maximum line lengths to
  2048 to prevent readline() calls from consuming too much memory.
  Patch by Jyrki Pulliainen.

* bpo-17997: Change behavior of "ssl.match_hostname()" to follow RFC
  6125, for security reasons.  It now doesn't match multiple wildcards
  nor wildcards inside IDN fragments.

* bpo-16039: CVE-2013-1752: Change use of readline in imaplib module
  to limit line length.  Patch by Emil Lind.

* bpo-19330: the unnecessary wrapper functions have been removed
  from the implementations of the new contextlib.redirect_stdout and
  contextlib.suppress context managers, which also ensures they
  provide reasonable help() output on instances

* bpo-19393: Fix symtable.symtable function to not be confused when
  there are functions or classes named "top".

* bpo-18685: Restore re performance to pre-PEP 393 levels.

* bpo-19339: telnetlib module is now using time.monotonic() when
  available to compute timeout.

* bpo-19399: fix sporadic test_subprocess failure.

* bpo-13234: Fix os.listdir to work with extended paths on Windows.
  Patch by Santoso Wijaya.

* bpo-19375: The site module adding a "site-python" directory to
  sys.path, if it exists, is now deprecated.

* bpo-19379: Lazily import linecache in the warnings module, to make
  startup with warnings faster until a warning gets printed.

* bpo-19288: Fixed the "in" operator of dbm.gnu databases for string
  argument.  Original patch by Arfrever Frehtes Taifersar Arahesis.

* bpo-19287: Fixed the "in" operator of dbm.ndbm databases for
  string argument.  Original patch by Arfrever Frehtes Taifersar
  Arahesis.

* bpo-19327: Fixed the working of regular expressions with too big
  charset.

* bpo-17400: New 'is_global' attribute for ipaddress to tell if an
  address is allocated by IANA for global or private networks.

* bpo-19350: Increasing the test coverage of macurl2path. Patch by
  Colin Williams.

* bpo-19365: Optimized the parsing of long replacement string in
  re.sub*() functions.

* bpo-19352: Fix unittest discovery when a module can be reached
  through several paths (e.g. under Debian/Ubuntu with virtualenv).

* bpo-15207: Fix mimetypes to read from correct part of Windows
  registry Original patch by Dave Chambers

* bpo-16595: Add prlimit() to resource module.

* bpo-19324: Expose Linux-specific constants in resource module.

* Load SSL's error strings in hashlib.

* bpo-18527: Upgrade internal copy of zlib to 1.2.8.

* bpo-19274: Add a filterfunc parameter to PyZipFile.writepy.

* bpo-8964: fix platform._sys_version to handle IronPython 2.6+.
  Patch by Martin Matusiak.

* bpo-19413: Restore pre-3.3 reload() semantics of re-finding
  modules.

* bpo-18958: Improve error message for json.load(s) while passing a
  string that starts with a UTF-8 BOM.

* bpo-19307: Improve error message for json.load(s) while passing
  objects of the wrong type.

* bpo-16038: CVE-2013-1752: ftplib: Limit amount of data read by
  limiting the call to readline().  Original patch by Michał
  Jastrzębski and Giampaolo Rodola.

* bpo-17087: Improved the repr for regular expression match objects.


Tests
-----

* bpo-19664: test_userdict's repr test no longer depends on the
  order of dict elements.

* bpo-19440: Clean up test_capi by removing an unnecessary
  __future__ import, converting from test_main to unittest.main, and
  running the _testcapi module tests as subTests of a unittest
  TestCase method.

* bpo-19378: the main dis module tests are now run with both stdout
  redirection *and* passing an explicit file parameter

* bpo-19378: removed the not-actually-helpful
  assertInstructionMatches and assertBytecodeExactlyMatches helpers
  from bytecode_helper

* bpo-18702: All skipped tests now reported as skipped.

* bpo-19439: interpreter embedding tests are now executed on Windows
  (Patch by Zachary Ware)

* bpo-19085: Added basic tests for all tkinter widget options.

* bpo-19384: Fix test_py_compile for root user, patch by Claudiu
  Popa.


Documentation
-------------

* bpo-18326: Clarify that list.sort's arguments are keyword-only.
  Also, attempt to reduce confusion in the glossary by not saying
  there are different "types" of arguments and parameters.


Build
-----

* bpo-19358: "make clinic" now runs the Argument Clinic preprocessor
  over all CPython source files.

* Update SQLite to 3.8.1, xz to 5.0.5, and Tcl/Tk to 8.6.1 on
  Windows.

* bpo-16632: Enable DEP and ASLR on Windows.

* bpo-17791: Drop PREFIX and EXEC_PREFIX definitions from
  PC/pyconfig.h

* Add workaround for VS 2010 nmake clean issue. VS 2010 doesn't set
  up PATH for nmake.exe correctly.

* bpo-19550: Implement Windows installer changes of PEP 453
  (ensurepip).

* bpo-19520: Fix compiler warning in the _sha3 module on 32bit
  Windows.

* bpo-19356: Avoid using a C variabled named "_self", it's a
  reserved word in some C compilers.

* bpo-15792: Correct build options on Win64. Patch by Jeremy Kloth.

* bpo-19373: Apply upstream change to Tk 8.5.15 fixing OS X 10.9
  screen refresh problem for OS X installer build.

* bpo-19649: On OS X, the same set of file names are now installed
  in bin directories for all configurations: non-framework vs
  framework, and single arch vs universal builds.  pythonx.y-32 is now
  always installed for 64-bit/32-bit universal builds.  The obsolete
  and undocumented pythonw* symlinks are no longer installed anywhere.

* bpo-19553: PEP 453 - "make install" and "make altinstall" now
  install or upgrade pip by default, using the bundled pip provided by
  the new ensurepip module.  A new configure option, --with-
  ensurepip[=upgrade|install|no], is available to override the default
  ensurepip "--upgrade" option.  The option can also be set with "make
  [alt]install ENSUREPIP=[upgrade|install|no]".

* bpo-19551: PEP 453 - the OS X installer now installs pip by
  default.

* Update third-party libraries for OS X installers: xz 5.0.3 ->
  5.0.5, SQLite 3.7.13 -> 3.8.1

* bpo-15663: Revert OS X installer built-in Tcl/Tk support for
  3.4.0b1. Some third-party projects, such as Matplotlib and
  PIL/Pillow, depended on being able to build with Tcl and Tk
  frameworks in /Library/Frameworks.


Tools/Demos
-----------

* bpo-19730: Argument Clinic now supports all the existing PyArg
  "format units" as legacy converters, as well as two new features:
  "self converters" and the "version" directive.

* bpo-19552: pyvenv now bootstraps pip into virtual environments by
  default (pass --without-pip to request the old behaviour)

* bpo-19390: Argument Clinic no longer accepts malformed Python and
  C ids.


Python 3.4.0 alpha 4
====================

*Release date: 2013-10-20*


Core and Builtins
-----------------

* bpo-19301: Give classes and functions that are explicitly marked
  global a global qualname.

* bpo-19279: UTF-7 decoder no longer produces illegal strings.

* bpo-16612: Add "Argument Clinic", a compile-time preprocessor for
  C files to generate argument parsing code.  (See PEP 436.)

* bpo-18810: Shift stat calls in importlib.machinery.FileFinder such
  that the code is optimistic that if something exists in a directory
  named exactly like the possible package being searched for that it's
  in actuality a directory.

* bpo-18416: importlib.machinery.PathFinder now treats '' as the cwd
  and importlib.machinery.FileFinder no longer special-cases '' to
  '.'. This leads to modules imported from cwd to now possess an
  absolute file path for __file__ (this does not affect modules
  specified by path on the CLI but it does affect -m/runpy). It also
  allows FileFinder to be more consistent by not having an edge case.

* bpo-4555: All exported C symbols are now prefixed with either "Py"
  or "_Py".

* bpo-19219: Speed up marshal.loads(), and make pyc files slightly
  (5% to 10%) smaller.

* bpo-19221: Upgrade Unicode database to version 6.3.0.

* bpo-16742: The result of the C callback
  PyOS_ReadlineFunctionPointer must now be a string allocated by
  PyMem_RawMalloc() or PyMem_RawRealloc() (or NULL if an error
  occurred), instead of a string allocated by PyMem_Malloc() or
  PyMem_Realloc().

* bpo-19199: Remove "PyThreadState.tick_counter" field

* Fix macro expansion of _PyErr_OCCURRED(), and make sure to use it
  in at least one place so as to avoid regressions.

* bpo-19087: Improve bytearray allocation in order to allow cheap
  popping of data at the front (slice deletion).

* bpo-19014: memoryview.cast() is now allowed on zero-length views.

* bpo-18690: memoryview is now automatically registered with
  collections.abc.Sequence

* bpo-19078: memoryview now correctly supports the reversed builtin
  (Patch by Claudiu Popa)


Library
-------

* bpo-17457: unittest test discovery now works with namespace
  packages. Patch by Claudiu Popa.

* bpo-18235: Fix the sysconfig variables LDSHARED and BLDSHARED
  under AIX. Patch by David Edelsohn.

* bpo-18606: Add the new "statistics" module (PEP 450).  Contributed
  by Steven D'Aprano.

* bpo-12866: The audioop module now supports 24-bit samples.

* bpo-19254: Provide an optimized Python implementation of
  pbkdf2_hmac.

* bpo-19201: Add "x" mode (exclusive creation) in opening file to
  bz2, gzip and lzma modules. Patches by Tim Heaney and Vajrasky Kok.
  (See also: bpo-19222, bpo-19223)

* Fix a reference count leak in _sre.

* bpo-19262: Initial check in of the 'asyncio' package (a.k.a.
  Tulip, a.k.a. PEP 3156). There are no docs yet, and the PEP is
  slightly out of date with the code. This module will have
  *provisional* status in Python 3.4.

* bpo-19276: Fixed the wave module on 64-bit big-endian platforms.

* bpo-19266: Rename the new-in-3.4 "contextlib.ignore" context
  manager to "contextlib.suppress" in order to be more consistent with
  existing descriptions of that operation elsewhere in the language
  and standard library documentation (Patch by Zero Piraeus).

* bpo-18891: Completed the new email package (provisional) API
  additions by adding new classes EmailMessage, MIMEPart, and
  ContentManager.

* bpo-18281: Unused stat constants removed from "tarfile".

* bpo-18999: Multiprocessing now supports 'contexts' with the same
  API as the module, but bound to specified start methods.

* bpo-18468: The re.split, re.findall, and re.sub functions and the
  group() and groups() methods of match object now always return a
  string or a bytes object.

* bpo-18725: The textwrap module now supports truncating multiline
  text.

* bpo-18776: atexit callbacks now display their full traceback when
  they raise an exception.

* bpo-17827: Add the missing documentation for "codecs.encode" and
  "codecs.decode".

* bpo-19218: Rename collections.abc to _collections_abc in order to
  speed up interpreter start.

* bpo-18582: Add 'pbkdf2_hmac' to the hashlib module. It implements
  PKCS#5 password-based key derivation functions with HMAC as
  pseudorandom function.

* bpo-19131: The aifc module now correctly reads and writes
  sampwidth of compressed streams.

* bpo-19209: Remove import of copyreg from the os module to speed up
  interpreter startup. stat_result and statvfs_result are now hard-
  coded to reside in the os module.

* bpo-19205: Don't import the 're' module in site and sysconfig
  module to speed up interpreter start.

* bpo-9548: Add a minimal "_bootlocale" module that is imported by
  the _io module instead of the full locale module.

* bpo-18764: Remove the 'print' alias for the PDB 'p' command so
  that it no longer shadows the print function.

* bpo-19158: A rare race in BoundedSemaphore could allow .release()
  too often.

* bpo-15805: Add contextlib.redirect_stdout().

* bpo-18716: Deprecate the formatter module.

* bpo-10712: 2to3 has a new "asserts" fixer that replaces deprecated
  names of unittest methods (e.g. failUnlessEqual -> assertEqual).

* bpo-18037: 2to3 now escapes "'\u'" and "'\U'" in native strings.

* bpo-17839: base64.decodebytes and base64.encodebytes now accept
  any object that exports a 1 dimensional array of bytes (this means
  the same is now also true for base64_codec)

* bpo-19132: The pprint module now supports compact mode.

* bpo-19137: The pprint module now correctly formats instances of
  set and frozenset subclasses.

* bpo-10042: functools.total_ordering now correctly handles
  NotImplemented being returned by the underlying comparison function
  (Patch by Katie Miller)

* bpo-19092: contextlib.ExitStack now correctly reraises exceptions
  from the __exit__ callbacks of inner context managers (Patch by
  Hrvoje Nikšić)

* bpo-12641: Avoid passing "-mno-cygwin" to the mingw32 compiler,
  except when necessary. Patch by Oscar Benjamin.

* bpo-5845: In site.py, only load readline history from
  ~/.python_history if no history has been read already.  This avoids
  double writes to the history file at shutdown.

* Properly initialize all fields of a SSL object after allocation.

* bpo-19095: SSLSocket.getpeercert() now raises ValueError when the
  SSL handshake hasn't been done.

* bpo-4366: Fix building extensions on all platforms when --enable-
  shared is used.

* bpo-19030: Fixed "inspect.getmembers" and
  "inspect.classify_class_attrs" to attempt activating descriptors
  before falling back to a __dict__ search for faulty descriptors.
  "inspect.classify_class_attrs" no longer returns Attributes whose
  home class is None.


C API
-----

* bpo-1772673: The type of "char*" arguments now changed to "const
  char*".

* bpo-16129: Added a "Py_SetStandardStreamEncoding" pre-
  initialization API to allow embedding applications like Blender to
  force a particular encoding and error handler for the standard IO
  streams (initial patch by Bastien Montagne)


Tests
-----

* bpo-19275: Fix test_site on AMD64 Snow Leopard

* bpo-14407: Fix unittest test discovery in test_concurrent_futures.

* bpo-18919: Unified and extended tests for audio modules: aifc,
  sunau and wave.

* bpo-18714: Added tests for "pdb.find_function()".


Documentation
-------------

* bpo-18758: Fixed and improved cross-references.

* bpo-18972: Modernize email examples and use the argparse module in
  them.


Build
-----

* bpo-19130: Correct PCbuild/readme.txt, Python 3.3 and 3.4 require
  VS 2010.

* bpo-15663: Update OS X 10.6+ installer to use Tcl/Tk 8.5.15.

* bpo-14499: Fix several problems with OS X universal build support:
  1. ppc arch detection for extension module builds broke with Xcode 5
  2. ppc arch detection in configure did not work on OS X 10.4   3.
  -sysroot and -arch flags were unnecessarily duplicated   4. there
  was no obvious way to configure an intel-32 only build.

* bpo-19019: Change the OS X installer build script to use CFLAGS
  instead of OPT for special build options.  By setting OPT, some
  compiler-specific options like -fwrapv were overridden and thus not
  used, which could result in broken interpreters when building with
  clang.


Python 3.4.0 alpha 3
====================

*Release date: 2013-09-29*


Core and Builtins
-----------------

* bpo-18818: The "encodingname" part of PYTHONIOENCODING is now
  optional.

* bpo-19098: Prevent overflow in the compiler when the recursion
  limit is set absurdly high.


Library
-------

* bpo-18929: "inspect.classify_class_attrs()" now correctly finds
  class attributes returned by "dir()" that are located in the
  metaclass.

* bpo-18950: Fix miscellaneous bugs in the sunau module.
  Au_read.readframes() now updates current file position and reads
  correct number of frames from multichannel stream.
  Au_write.writeframesraw() now correctly updates current file
  position.  Au_read.getnframes() now returns an integer (as in Python
  2). Au_read and Au_write now correctly works with file object if
  start file position is not a zero.

* bpo-18594: The fast path for collections.Counter() was never taken
  due to an over- restrictive type check.

* bpo-19053: ZipExtFile.read1() with non-zero argument no more
  returns empty bytes until end of data.

* logging: added support for Unix domain sockets to SocketHandler
  and DatagramHandler.

* bpo-18996: TestCase.assertEqual() now more cleverly shorten
  differing strings in error report.

* bpo-19034: repr() for tkinter.Tcl_Obj now exposes string
  reperesentation.

* bpo-18978: "urllib.request.Request" now allows the method to be
  indicated on the class and no longer sets it to None in "__init__".

* bpo-18626: the inspect module now offers a basic command line
  introspection interface (Initial patch by Claudiu Popa)

* bpo-3015: Fixed tkinter with wantobject=False.  Any Tcl command
  call returned empty string.

* bpo-19037: The mailbox module now makes all changes to maildir
  files before moving them into place, to avoid race conditions with
  other programs that may be accessing the maildir directory.

* bpo-14984: On POSIX systems, when netrc is called without a
  filename argument (and therefore is reading the user's $HOME/.netrc
  file), it now enforces the same security rules as typical ftp
  clients: the .netrc file must be owned by the user that owns the
  process and must not be readable by any other user.

* bpo-18873: The tokenize module now detects Python source code
  encoding only in comment lines.

* bpo-17764: Enable http.server to bind to a user specified network
  interface.  Patch contributed by Malte Swart.

* bpo-18937: Add an assertLogs() context manager to
  unittest.TestCase to ensure that a block of code emits a message
  using the logging module.

* bpo-17324: Fix http.server's request handling case on trailing
  '/'. Patch contributed by Vajrasky Kok.

* bpo-19018: The heapq.merge() function no longer suppresses
  IndexError in the underlying iterables.

* bpo-18784: The uuid module no longer attempts to load libc via
  ctypes.CDLL if all the necessary functions have already been found
  in libuuid.  Patch by Evgeny Sologubov.

* The "PYTHONFAULTHANDLER" environment variable now only enables the
  faulthandler module if the variable is non-empty. Same behaviour
  than other variables like "PYTHONDONTWRITEBYTECODE".

* bpo-1565525: New function "traceback.clear_frames" will clear the
  local variables of all the stack frames referenced by a traceback
  object.


Tests
-----

* bpo-18952: Fix regression in support data downloads introduced
  when test.support was converted to a package. Regression noticed by
  Zachary Ware.


IDLE
----

* bpo-18873: IDLE now detects Python source code encoding only in
  comment lines.

* bpo-18988: The "Tab" key now works when a word is already
  autocompleted.


Documentation
-------------

* bpo-17003: Unified the size argument names in the io module with
  common practice.


Build
-----

* bpo-18596: Support the use of address sanity checking in recent
  versions of clang and GCC by appropriately marking known false
  alarms in the small object allocator. Patch contributed by Dhiru
  Kholia.


Tools/Demos
-----------

* bpo-18873: 2to3 and the findnocoding.py script now detect Python
  source code encoding only in comment lines.


Python 3.4.0 alpha 2
====================

*Release date: 2013-09-09*


Core and Builtins
-----------------

* bpo-18942: sys._debugmallocstats() output was damaged on Windows.

* bpo-18571: Implementation of the PEP 446: file descriptors and
  file handles are now created non-inheritable; add functions
  os.get/set_inheritable(), os.get/set_handle_inheritable() and
  socket.socket.get/set_inheritable().

* bpo-11619: The parser and the import machinery do not encode
  Unicode filenames anymore on Windows.

* bpo-18808: Non-daemon threads are now automatically joined when a
  sub-interpreter is shutdown (it would previously dump a fatal
  error).

* Remove support for compiling on systems without getcwd().

* bpo-18774: Remove last bits of GNU PTH thread code and
  thread_pth.h.

* bpo-18771: Add optimization to set object lookups to reduce the
  cost of hash collisions.  The core idea is to inspect a second
  key/hash pair for each cache line retrieved.

* bpo-16105: When a signal handler fails to write to the file
  descriptor registered with "signal.set_wakeup_fd()", report an
  exception instead of ignoring the error.

* bpo-18722: Remove uses of the "register" keyword in C code.

* bpo-18667: Add missing "HAVE_FCHOWNAT" symbol to
  posix._have_functions.

* bpo-16499: Add command line option for isolated mode.

* bpo-15301: Parsing fd, uid, and gid parameters for builtins in
  Modules/posixmodule.c is now far more robust.

* bpo-18368: PyOS_StdioReadline() no longer leaks memory when
  realloc() fail.

* bpo-17934: Add a clear() method to frame objects, to help clean up
  expensive details (local variables) and break reference cycles.

* bpo-18780: %-formatting codes %d, %i, and %u now treat int-
  subclasses as int (displays value of int-subclass instead of str
  (int-subclass) ).


Library
-------

* bpo-18808: Thread.join() now waits for the underlying thread state
  to be destroyed before returning.  This prevents unpredictable
  aborts in Py_EndInterpreter() when some non-daemon threads are still
  running.

* bpo-18458: Prevent crashes with newer versions of libedit.  Its
  readline emulation has changed from 0-based indexing to 1-based like
  gnu readline.

* bpo-18852: Handle case of "readline.__doc__" being "None" in the
  new readline activation code in "site.py".

* bpo-18672: Fixed format specifiers for Py_ssize_t in debugging
  output in the _sre module.

* bpo-18830: inspect.getclasstree() no longer produces duplicate
  entries even when input list contains duplicates.

* bpo-18878: sunau.open now supports the context management
  protocol. Based on patches by Claudiu Popa and R. David Murray.

* bpo-18909: Fix _tkinter.tkapp.interpaddr() on Windows 64-bit,
  don't cast 64-bit pointer to long (32 bits).

* bpo-18876: The FileIO.mode attribute now better reflects the
  actual mode under which the file was opened.  Patch by Erik Bray.

* bpo-16853: Add new selectors module.

* bpo-18882: Add threading.main_thread() function.

* bpo-18901: The sunau getparams method now returns a namedtuple
  rather than a plain tuple.  Patch by Claudiu Popa.

* bpo-17487: The result of the wave getparams method now is
  pickleable again. Patch by Claudiu Popa.

* bpo-18756: os.urandom() now uses a lazily-opened persistent file
  descriptor, so as to avoid using many file descriptors when run in
  parallel from multiple threads.

* bpo-18418: After fork(), reinit all threads states, not only
  active ones. Patch by A. Jesse Jiryu Davis.

* bpo-17974: Switch unittest from using getopt to using argparse.

* bpo-11798: TestSuite now drops references to own tests after
  execution.

* bpo-16611: http.cookie now correctly parses the 'secure' and
  'httponly' cookie flags.

* bpo-11973: Fix a problem in kevent. The flags and fflags fields
  are now properly handled as unsigned.

* bpo-18807: "pyvenv" now takes a --copies argument allowing copies
  instead of symlinks even where symlinks are available and the
  default.

* bpo-18538: "python -m dis" now uses argparse for argument
  processing. Patch by Michele Orrù.

* bpo-18394: Close cgi.FieldStorage's optional file.

* bpo-17702: On error, os.environb now suppresses the exception
  context when raising a new KeyError with the original key.

* bpo-16809: Fixed some tkinter incompatibilities with Tcl/Tk 8.6.

* bpo-16809: Tkinter's splitlist() and split() methods now accept
  Tcl_Obj argument.

* bpo-18324: set_payload now correctly handles binary input.  This
  also supersedes the previous fixes for #14360, #1717, and #16564.

* bpo-18794: Add a fileno() method and a closed attribute to
  select.devpoll objects.

* bpo-17119: Fixed integer overflows when processing large strings
  and tuples in the tkinter module.

* bpo-18747: Re-seed OpenSSL's pseudo-random number generator after
  fork. A pthread_atfork() parent handler is used to seed the PRNG
  with pid, time and some stack data.

* bpo-8865: Concurrent invocation of select.poll.poll() now raises a
  RuntimeError exception.  Patch by Christian Schubert.

* bpo-18777: The ssl module now uses the new CRYPTO_THREADID API of
  OpenSSL 1.0.0+ instead of the deprecated CRYPTO id callback
  function.

* bpo-18768: Correct doc string of RAND_edg(). Patch by Vajrasky
  Kok.

* bpo-18178: Fix ctypes on BSD. dlmalloc.c was compiled twice which
  broke malloc weak symbols.

* bpo-18709: Fix CVE-2013-4238. The SSL module now handles NULL
  bytes inside subjectAltName correctly. Formerly the module has used
  OpenSSL's GENERAL_NAME_print() function to get the string
  representation of ASN.1 strings for "rfc822Name" (email), "dNSName"
  (DNS) and "uniformResourceIdentifier" (URI).

* bpo-18701: Remove support of old CPython versions (<3.0) from C
  code.

* bpo-18756: Improve error reporting in os.urandom() when the
  failure is due to something else than /dev/urandom not existing (for
  example, exhausting the file descriptor limit).

* bpo-18673: Add O_TMPFILE to os module. O_TMPFILE requires Linux
  kernel 3.11 or newer. It's only defined on system with 3.11 uapi
  headers, too.

* bpo-18532: Change the builtin hash algorithms' names to lower case
  names as promised by hashlib's documentation.

* bpo-8713: add new spwan and forkserver start methods, and new
  functions get_all_start_methods, get_start_method, and
  set_start_method, to multiprocessing.

* bpo-18405: Improve the entropy of crypt.mksalt().

* bpo-12015: The tempfile module now uses a suffix of 8 random
  characters instead of 6, to reduce the risk of filename collision.
  The entropy was reduced when uppercase letters were removed from the
  charset used to generate random characters.

* bpo-18585: Add "textwrap.shorten()" to collapse and truncate a
  piece of text to a given length.

* bpo-18598: Tweak exception message for importlib.import_module()
  to include the module name when a key argument is missing.

* bpo-19151: Fix docstring and use of _get_supported_file_loaders()
  to reflect 2-tuples.

* bpo-19152: Add ExtensionFileLoader.get_filename().

* bpo-18676: Change 'positive' to 'non-negative' in queue.py put and
  get docstrings and ValueError messages. Patch by Zhongyue Luo

* Fix refcounting issue with extension types in tkinter.

* bpo-8112: xlmrpc.server's DocXMLRPCServer server no longer raises
  an error if methods have annotations; it now correctly displays the
  annotations.

* bpo-18600: Added policy argument to
  email.message.Message.as_string, and as_bytes and __bytes__ methods
  to Message.

* bpo-18671: Output more information when logging exceptions occur.

* bpo-18621: Prevent the site module's patched builtins from keeping
  too many references alive for too long.

* bpo-4885: Add weakref support to mmap objects.  Patch by Valerie
  Lambert.

* bpo-8860: Fixed rounding in timedelta constructor.

* bpo-18849: Fixed a Windows-specific tempfile bug where collision
  with an existing directory caused mkstemp and related APIs to fail
  instead of retrying. Report and fix by Vlad Shcherbina.

* bpo-18920: argparse's default destination for the version action
  (-v, --version) has also been changed to stdout, to match the Python
  executable.


Tests
-----

* bpo-18623: Factor out the _SuppressCoreFiles context manager into
  test.support.  Patch by Valerie Lambert.

* bpo-12037: Fix test_email for desktop Windows.

* bpo-15507: test_subprocess's test_send_signal could fail if the
  test runner were run in an environment where the process inherited
  an ignore setting for SIGINT. Restore the SIGINT handler to the
  desired KeyboardInterrupt raising one during that test.

* bpo-16799: Switched from getopt to argparse style in regrtest's
  argument parsing. Added more tests for regrtest's argument parsing.

* bpo-18792: Use "127.0.0.1" or "::1" instead of "localhost" as much
  as possible, since "localhost" goes through a DNS lookup under
  recent Windows versions.


IDLE
----

* bpo-18489: Add tests for SearchEngine. Original patch by Phil
  Webster.


Documentation
-------------

* bpo-18743: Fix references to non-existent "StringIO" module.

* bpo-18783: Removed existing mentions of Python long type in
  docstrings, error messages and comments.


Build
-----

* bpo-1584: Provide configure options to override default search
  paths for Tcl and Tk when building _tkinter.

* bpo-15663: Tcl/Tk 8.5.14 is now included with the OS X 10.6+
  64-/32-bit installer.  It is no longer necessary to install a third-
  party version of Tcl/Tk 8.5 to work around the problems in the
  Apple-supplied Tcl/Tk 8.5 shipped in OS X 10.6 and later releases.


Tools/Demos
-----------

* bpo-18922: Now The Lib/smtpd.py and Tools/i18n/msgfmt.py scripts
  write their version strings to stdout, and not to sderr.


Python 3.4.0 alpha 1
====================

*Release date: 2013-08-03*


Core and Builtins
-----------------

* bpo-16741: Fix an error reporting in int().

* bpo-17899: Fix rare file descriptor leak in os.listdir().

* bpo-10241: Clear extension module dict copies at interpreter
  shutdown. Patch by Neil Schemenauer, minimally modified.

* bpo-9035: ismount now recognises volumes mounted below a drive
  root on Windows. Original patch by Atsuo Ishimoto.

* bpo-18214: Improve finalization of Python modules to avoid setting
  their globals to None, in most cases.

* bpo-18112: PEP 442 implementation (safe object finalization).

* bpo-18552: Check return value of PyArena_AddPyObject() in
  obj2ast_object().

* bpo-18560: Fix potential NULL pointer dereference in sum().

* bpo-18520: Add a new PyStructSequence_InitType2() function, same
  than PyStructSequence_InitType() except that it has a return value
  (0 on success, -1 on error).

* bpo-15905: Fix theoretical buffer overflow in handling of
  sys.argv[0], prefix and exec_prefix if the operation system does not
  obey MAXPATHLEN.

* bpo-18408: Fix many various bugs in code handling errors,
  especially on memory allocation failure (MemoryError).

* bpo-18344: Fix potential ref-leaks in _bufferedreader_read_all().

* bpo-18342: Use the repr of a module name when an import fails when
  using "from ... import ...".

* bpo-17872: Fix a segfault in marshal.load() when input stream
  returns more bytes than requested.

* bpo-18338: "python --version" now prints version string to stdout,
  and not to stderr. Patch by Berker Peksag and Michael Dickens.

* bpo-18426: Fix NULL pointer dereference in C extension import when
  PyModule_GetDef() returns an error.

* bpo-17206: On Windows, increase the stack size from 2 MB to 4.2 MB
  to fix a stack overflow in the marshal module (fix a crash in
  test_marshal). Patch written by Jeremy Kloth.

* bpo-3329: Implement the PEP 445: Add new APIs to customize Python
  memory allocators.

* bpo-18328: Reorder ops in PyThreadState_Delete*() functions. Now
  the tstate is first removed from TLS and then deallocated.

* bpo-13483: Use VirtualAlloc in obmalloc on Windows.

* bpo-18184: PyUnicode_FromFormat() and PyUnicode_FromFormatV() now
  raise OverflowError when an argument of %c format is out of range.

* bpo-18111: The min() and max() functions now support a default
  argument to be returned instead of raising a ValueError on an empty
  sequence. (Contributed by Julian Berman.)

* bpo-18137: Detect integer overflow on precision in
  float.__format__() and complex.__format__().

* bpo-18183: Fix various unicode operations on strings with large
  unicode codepoints.

* bpo-18180: Fix ref leak in _PyImport_GetDynLoadWindows().

* bpo-18038: SyntaxError raised during compilation sources with
  illegal encoding now always contains an encoding name.

* bpo-17931: Resolve confusion on Windows between pids and process
  handles.

* Tweak the exception message when the magic number or size value in
  a bytecode file is truncated.

* bpo-17932: Fix an integer overflow issue on Windows 64-bit in
  iterators: change the C type of seqiterobject.it_index from long to
  Py_ssize_t.

* bpo-18065: Don't set __path__ to the package name for frozen
  packages.

* bpo-18088: When reloading a module, unconditionally reset all
  relevant attributes on the module (e.g. __name__, __loader__,
  __package__, __file__, __cached__).

* bpo-17937: Try harder to collect cyclic garbage at shutdown.

* bpo-12370: Prevent class bodies from interfering with the
  __class__ closure.

* bpo-17644: Fix a crash in str.format when curly braces are used in
  square brackets.

* bpo-17237: Fix crash in the ASCII decoder on m68k.

* bpo-17927: Frame objects kept arguments alive if they had been
  copied into a cell, even if the cell was cleared.

* bpo-1545463: At shutdown, defer finalization of codec modules so
  that stderr remains usable.

* bpo-7330: Implement width and precision (ex: "%5.3s") for the
  format string of PyUnicode_FromFormat() function, original patch
  written by Ysj Ray.

* bpo-1545463: Global variables caught in reference cycles are now
  garbage-collected at shutdown.

* bpo-17094: Clear stale thread states after fork().  Note that this
  is a potentially disruptive change since it may release some system
  resources which would otherwise remain perpetually alive (e.g.
  database connections kept in thread-local storage).

* bpo-17408: Avoid using an obsolete instance of the copyreg module
  when the interpreter is shutdown and then started again.

* bpo-5845: Enable tab-completion in the interactive interpreter by
  default, thanks to a new sys.__interactivehook__.

* bpo-17115: Module initialization now includes setting __package__
  and __loader__ attributes to None. (See also: bpo-17116)

* bpo-17853: Ensure locals of a class that shadow free variables
  always win over the closures.

* bpo-17863: In the interactive console, don't loop forever if the
  encoding can't be fetched from stdin.

* bpo-17867: Raise an ImportError if __import__ is not found in
  __builtins__.

* bpo-18698: Ensure importlib.reload() returns the module out of
  sys.modules.

* bpo-17857: Prevent build failures with pre-3.5.0 versions of
  sqlite3, such as was shipped with Centos 5 and Mac OS X 10.4.

* bpo-17413: sys.settrace callbacks were being passed a string
  instead of an exception instance for the 'value' element of the arg
  tuple if the exception originated from C code; now an exception
  instance is always provided.

* bpo-17782: Fix undefined behaviour on platforms where "struct
  timespec"'s "tv_nsec" member is not a C long.

* bpo-17722: When looking up __round__, resolve descriptors.

* bpo-16061: Speed up str.replace() for replacing 1-character
  strings.

* bpo-17715: Fix segmentation fault from raising an exception in a
  __trunc__ method.

* bpo-17643: Add __callback__ attribute to weakref.ref.

* bpo-16447: Fixed potential segmentation fault when setting
  __name__ on a class.

* bpo-17669: Fix crash involving finalization of generators using
  yield from.

* bpo-14439: Python now prints the traceback on runpy failure at
  startup.

* bpo-17469: Fix _Py_GetAllocatedBlocks() and
  sys.getallocatedblocks() when running on valgrind.

* bpo-17619: Make input() check for Ctrl-C correctly on Windows.

* bpo-17357: Add missing verbosity messages for -v/-vv that were
  lost during the importlib transition.

* bpo-17610: Don't rely on non-standard behavior of the C qsort()
  function.

* bpo-17323: The "[X refs, Y blocks]" printed by debug builds has
  been disabled by default.  It can be re-enabled with the "-X
  showrefcount" option.

* bpo-17328: Fix possible refleak in dict.setdefault.

* bpo-17275: Corrected class name in init error messages of the C
  version of BufferedWriter and BufferedRandom.

* bpo-7963: Fixed misleading error message that issued when object
  is called without arguments.

* bpo-8745: Small speed up zipimport on Windows. Patch by Catalin
  Iacob.

* bpo-5308: Raise ValueError when marshalling too large object (a
  sequence with size >= 2**31), instead of producing illegal marshal
  data.

* bpo-12983: Bytes literals with invalid "\x" escape now raise a
  SyntaxError and a full traceback including line number.

* bpo-16967: In function definition, evaluate positional defaults
  before keyword-only defaults.

* bpo-17173: Remove uses of locale-dependent C functions (isalpha()
  etc.) in the interpreter.

* bpo-17137: When a Unicode string is resized, the internal wide
  character string (wstr) format is now cleared.

* bpo-17043: The unicode-internal decoder no longer read past the
  end of input buffer.

* bpo-17098: All modules now have __loader__ set even if they pre-
  exist the bootstrapping of importlib.

* bpo-16979: Fix error handling bugs in the unicode-escape-decode
  decoder.

* bpo-16772: The base argument to the int constructor no longer
  accepts floats, or other non-integer objects with an __int__ method.
  Objects with an __index__ method are now accepted.

* bpo-10156: In the interpreter's initialization phase, unicode
  globals are now initialized dynamically as needed.

* bpo-16980: Fix processing of escaped non-ascii bytes in the
  unicode- escape-decode decoder.

* bpo-16975: Fix error handling bug in the escape-decode bytes
  decoder.

* bpo-14850: Now a charmap decoder treats U+FFFE as "undefined
  mapping" in any mapping, not only in a string.

* bpo-16613: Add *m* argument to "collections.Chainmap.new_child" to
  allow the new child map to be specified explicitly.

* bpo-16730: importlib.machinery.FileFinder now no longers raises an
  exception when trying to populate its cache and it finds out the
  directory is unreadable or has turned into a file. Reported and
  diagnosed by David Pritchard.

* bpo-16906: Fix a logic error that prevented most static strings
  from being cleared.

* bpo-11461: Fix the incremental UTF-16 decoder. Original patch by
  Amaury Forgeot d'Arc.

* bpo-16856: Fix a segmentation fault from calling repr() on a dict
  with a key whose repr raise an exception.

* bpo-16367: Fix FileIO.readall() on Windows for files larger than 2
  GB.

* bpo-16761: Calling int() with base argument only now raises
  TypeError.

* bpo-16759: Support the full DWORD (unsigned long) range in Reg2Py
  when retrieving a REG_DWORD value. This corrects functions like
  winreg.QueryValueEx that may have been returning truncated values.

* bpo-14420: Support the full DWORD (unsigned long) range in Py2Reg
  when passed a REG_DWORD value. Fixes OverflowError in
  winreg.SetValueEx.

* bpo-11939: Set the st_dev attribute of stat_result to allow
  Windows to take advantage of the
  os.path.samefile/sameopenfile/samestat implementations used by other
  platforms.

* bpo-16772: The int() constructor's second argument (base) no
  longer accepts non integer values.  Consistent with the behavior in
  Python 2.

* bpo-14470: Remove w9xpopen support per PEP 11.

* bpo-9856: Replace deprecation warning with raising TypeError in
  object.__format__. Patch by Florent Xicluna.

* bpo-16597: In buffered and text IO, call close() on the underlying
  stream if invoking flush() fails.

* bpo-16722: In the bytes() constructor, try to call __bytes__ on
  the argument before __index__.

* bpo-16421: loading multiple modules from one shared object is now
  handled correctly (previously, the first module loaded from that
  file was silently returned). Patch by Václav Šmilauer.

* bpo-16602: When a weakref's target was part of a long deallocation
  chain, the object could remain reachable through its weakref even
  though its refcount had dropped to zero.

* bpo-16495: Remove extraneous NULL encoding check from
  bytes_decode().

* bpo-16619: Create NameConstant AST class to represent None, True,
  and False literals. As a result, these constants are never loaded at
  runtime from builtins.

* bpo-16455: On FreeBSD and Solaris, if the locale is C, the
  ASCII/surrogateescape codec is now used (instead of the locale
  encoding) to decode the command line arguments. This change fixes
  inconsistencies with os.fsencode() and os.fsdecode(), because these
  operating systems announce an ASCII locale encoding, but actually
  use the ISO-8859-1 encoding in practice.

* bpo-16562: Optimize dict equality testing.  Patch by Serhiy
  Storchaka.

* bpo-16588: Silence unused-but-set warnings in
  Python/thread_pthread

* bpo-16592: stringlib_bytes_join doesn't raise MemoryError on
  allocation failure.

* bpo-16546: Fix: ast.YieldFrom argument is now mandatory.

* bpo-16514: Fix regression causing a traceback when sys.path[0] is
  None (actually, any non-string or non-bytes type).

* bpo-16306: Fix multiple error messages when unknown command line
  parameters where passed to the interpreter.  Patch by Hieu Nguyen.

* bpo-16215: Fix potential double memory free in str.replace().
  Patch by Serhiy Storchaka.

* bpo-16290: A float return value from the __complex__ special
  method is no longer accepted in the complex() constructor.

* bpo-16416: On Mac OS X, operating system data are now always
  encoded/decoded to/from UTF-8/surrogateescape, instead of the locale
  encoding (which may be ASCII if no locale environment variable is
  set), to avoid inconsistencies with os.fsencode() and os.fsdecode()
  functions which are already using UTF-8/surrogateescape.

* bpo-16453: Fix equality testing of dead weakref objects.

* bpo-9535: Fix pending signals that have been received but not yet
  handled by Python to not persist after os.fork() in the child
  process.

* bpo-14794: Fix slice.indices to return correct results for huge
  values, rather than raising OverflowError.

* bpo-15001: fix segfault on "del sys.modules['__main__']". Patch by
  Victor Stinner.

* bpo-8271: the utf-8 decoder now outputs the correct number of
  U+FFFD characters when used with the 'replace' error handler on
  invalid utf-8 sequences.  Patch by Serhiy Storchaka, tests by Ezio
  Melotti.

* bpo-5765: Apply a hard recursion limit in the compiler instead of
  blowing the stack and segfaulting. Initial patch by Andrea Griffini.

* bpo-16402: When slicing a range, fix shadowing of exceptions from
  __index__.

* bpo-16336: fix input checking in the surrogatepass error handler.
  Patch by Serhiy Storchaka.

* bpo-8401: assigning an int to a bytearray slice (e.g. b[3:4] = 5)
  now raises an error.

* bpo-7317: Display full tracebacks when an error occurs
  asynchronously. Patch by Alon Horev with update by Alexey Kachayev.

* bpo-16309: Make PYTHONPATH="" behavior the same as if PYTHONPATH
  not set at all.

* bpo-10189: Improve the error reporting of SyntaxErrors related to
  global and nonlocal statements.

* Fix segfaults on setting __qualname__ on builtin types and
  attempting to delete it on any type.

* bpo-14625: Rewrite the UTF-32 decoder. It is now 3x to 4x faster.
  Patch written by Serhiy Storchaka.

* bpo-16345: Fix an infinite loop when "fromkeys" on a dict subclass
  received a nonempty dict from the constructor.

* bpo-16271: Fix strange bugs that resulted from __qualname__
  appearing in a class's __dict__ and on type.

* bpo-12805: Make bytes.join and bytearray.join faster when the
  separator is empty. Patch by Serhiy Storchaka.

* bpo-6074: Ensure cached bytecode files can always be updated by
  the user that created them, even when the source file is read-only.

* bpo-15958: bytes.join and bytearray.join now accept arbitrary
  buffer objects.

* bpo-14783: Improve int() docstring and switch docstrings for
  str(), range(), and slice() to use multi-line signatures.

* bpo-16160: Subclass support now works for types.SimpleNamespace.

* bpo-16148: Implement PEP 424, adding operator.length_hint and
  PyObject_LengthHint.

* Upgrade Unicode data (UCD) to version 6.2.

* bpo-15379: Fix passing of non-BMP characters as integers for the
  charmap decoder (already working as unicode strings).  Patch by
  Serhiy Storchaka.

* bpo-15144: Fix possible integer overflow when handling pointers as
  integer values, by using "Py_uintptr_t" instead of "size_t".  Patch
  by Serhiy Storchaka.

* bpo-15965: Explicitly cast "AT_FDCWD" as (int).  Required on
  Solaris 10 (which defines "AT_FDCWD" as "0xffd19553"), harmless on
  other platforms.

* bpo-15839: Convert SystemErrors in "super()" to RuntimeErrors.

* bpo-15448: Buffered IO now frees the buffer when closed, instead
  of when deallocating.

* bpo-15846: Fix SystemError which happened when using "ast.parse()"
  in an exception handler on code with syntax errors.

* bpo-15897: zipimport.c doesn't check return value of fseek().
  Patch by Felipe Cruz.

* bpo-15801: Make sure mappings passed to '%' formatting are
  actually subscriptable.

* bpo-15111: __import__ should propagate ImportError when raised as
  a side-effect of a module triggered from using fromlist.

* bpo-15022: Add pickle and comparison support to
  types.SimpleNamespace.


Library
-------

* bpo-4331: Added functools.partialmethod (Initial patch by Alon
  Horev)

* bpo-13461: Fix a crash in the TextIOWrapper.tell method on 64-bit
  platforms.  Patch by Yogesh Chaudhari.

* bpo-18681: Fix a NameError in importlib.reload() (noticed by
  Weizhao Li).

* bpo-14323: Expanded the number of digits in the coefficients for
  the RGB -- YIQ conversions so that they match the FCC NTSC versions.

* bpo-17998: Fix an internal error in regular expression engine.

* bpo-17557: Fix os.getgroups() to work with the modified behavior
  of getgroups(2) on OS X 10.8.  Original patch by Mateusz Lenik.

* bpo-18608: Avoid keeping a strong reference to the locale module
  inside the _io module.

* bpo-18619: Fix atexit leaking callbacks registered from sub-
  interpreters, and make it GC-aware.

* bpo-15699: The readline module now uses PEP 3121-style module
  initialization, so as to reclaim allocated resources (Python
  callbacks) at shutdown.  Original patch by Robin Schreiber.

* bpo-17616: wave.open now supports the context management protocol.

* bpo-18599: Fix name attribute of _sha1.sha1() object. It now
  returns 'SHA1' instead of 'SHA'.

* bpo-13266: Added inspect.unwrap to easily unravel __wrapped__
  chains (initial patch by Daniel Urban and Aaron Iles)

* bpo-18561: Skip name in ctypes' _build_callargs() if name is NULL.

* bpo-18559: Fix NULL pointer dereference error in _pickle module

* bpo-18556: Check the return type of PyUnicode_AsWideChar() in
  ctype's U_set().

* bpo-17818: aifc.getparams now returns a namedtuple.

* bpo-18549: Eliminate dead code in socket_ntohl()

* bpo-18530: Remove additional stat call from posixpath.ismount.
  Patch by Alex Gaynor.

* bpo-18514: Fix unreachable Py_DECREF() call in
  PyCData_FromBaseObj()

* bpo-9177: Calling read() or write() now raises ValueError, not
  AttributeError, on a closed SSL socket.  Patch by Senko Rasic.

* bpo-18513: Fix behaviour of cmath.rect w.r.t. signed zeros on OS X
  10.8 + gcc.

* bpo-18479: Changed venv Activate.ps1 to make deactivate a
  function, and removed Deactivate.ps1.

* bpo-18480: Add missing call to PyType_Ready to the _elementtree
  extension.

* bpo-17778: Fix test discovery for test_multiprocessing. (Patch by
  Zachary Ware.)

* bpo-18393: The private module _gestalt and private functions
  platform._mac_ver_gestalt, platform._mac_ver_lookup and
  platform._bcd2str have been removed. This does not affect the public
  interface of the platform module.

* bpo-17482: functools.update_wrapper (and functools.wraps) now set
  the __wrapped__ attribute correctly even if the underlying function
  has a __wrapped__ attribute set.

* bpo-18431: The new email header parser now decodes RFC2047 encoded
  words in structured headers.

* bpo-18432: The sched module's queue method was incorrectly
  returning an iterator instead of a list.

* bpo-18044: The new email header parser was mis-parsing encoded
  words where an encoded character immediately followed the '?' that
  follows the CTE character, resulting in a decoding failure.  They
  are now decoded correctly.

* bpo-18101: Tcl.split() now process strings nested in a tuple as it
  do with byte strings.

* bpo-18116: getpass was always getting an error when testing
  /dev/tty, and thus was always falling back to stdin, and would then
  raise an exception if stdin could not be used (such as /dev/null).
  It also leaked an open file. All of these issues are now fixed.

* bpo-17198: Fix a NameError in the dbm module.  Patch by Valentina
  Mukhamedzhanova.

* bpo-18013: Fix cgi.FieldStorage to parse the W3C sample form.

* bpo-18020: improve html.escape speed by an order of magnitude.
  Patch by Matt Bryant.

* bpo-18347: ElementTree's html serializer now preserves the case of
  closing tags.

* bpo-17261: Ensure multiprocessing's proxies use proper address.

* bpo-18343: faulthandler.register() now keeps the previous signal
  handler when the function is called twice, so
  faulthandler.unregister() restores correctly the original signal
  handler.

* bpo-17097: Make multiprocessing ignore EINTR.

* bpo-18339: Negative ints keys in unpickler.memo dict no longer
  cause a segfault inside the _pickle C extension.

* bpo-18240: The HMAC module is no longer restricted to bytes and
  accepts any bytes-like object, e.g. memoryview. Original patch by
  Jonas Borgström.

* bpo-18224: Removed pydoc script from created venv, as it causes
  problems on Windows and adds no value over and above python -m pydoc
  ...

* bpo-18155: The csv module now correctly handles csv files that use
  a delimiter character that has a special meaning in regexes, instead
  of throwing an exception.

* bpo-14360: encode_quopri can now be successfully used as an
  encoder when constructing a MIMEApplication object.

* bpo-11390: Add -o and -f command line options to the doctest CLI
  to specify doctest options (and convert it to using argparse).

* bpo-18135: ssl.SSLSocket.write() now raises an OverflowError if
  the input string in longer than 2 gigabytes, and
  ssl.SSLContext.load_cert_chain() raises a ValueError if the password
  is longer than 2 gigabytes. The ssl module does not support partial
  write.

* bpo-11016: Add C implementation of the stat module as _stat.

* bpo-18248: Fix libffi build on AIX.

* bpo-18259: Declare sethostname in socketmodule.c for AIX

* bpo-18147: Add diagnostic functions to ssl.SSLContext().
  get_ca_list() lists all loaded CA certificates and
  cert_store_stats() returns amount of loaded X.509 certs, X.509 CA
  certs and CRLs.

* bpo-18167: cgi.FieldStorage no longer fails to handle multipart
  /form-data when "\r\n" appears at end of 65535 bytes without other
  newlines.

* bpo-18076: Introduce importlib.util.decode_source().

* bpo-18357: add tests for dictview set difference. Patch by Fraser
  Tweedale.

* importlib.abc.SourceLoader.get_source() no longer changes
  SyntaxError or UnicodeDecodeError into ImportError.

* bpo-18058: Make the namespace package loader meet the
  importlib.abc.InspectLoader ABC, allowing for namespace packages to
  work with runpy. (See also: bpo-18057)

* bpo-17177: The imp module is pending deprecation.

* subprocess: Prevent a possible double close of parent pipe fds
  when the subprocess exec runs into an error.  Prevent a regular
  multi- close of the /dev/null fd when any of stdin, stdout and
  stderr was set to DEVNULL.

* bpo-18194: Introduce importlib.util.cache_from_source() and
  source_from_cache() while documenting the equivalent functions in
  imp as deprecated.

* bpo-17907: Document imp.new_module() as deprecated in favour of
  types.ModuleType.

* bpo-18192: Introduce importlib.util.MAGIC_NUMBER and document as
  deprecated imp.get_magic().

* bpo-18149: Add filecmp.clear_cache() to manually clear the filecmp
  cache. Patch by Mark Levitt

* bpo-18193: Add importlib.reload().

* bpo-18157: Stop using imp.load_module() in pydoc.

* bpo-16102: Make uuid._netbios_getnode() work again on Python 3.

* bpo-17134: Add ssl.enum_cert_store() as interface to Windows' cert
  store.

* bpo-18143: Implement ssl.get_default_verify_paths() in order to
  debug the default locations for cafile and capath.

* bpo-17314: Move multiprocessing.forking over to importlib.

* bpo-11959: SMTPServer and SMTPChannel now take an optional map,
  use of which avoids affecting global state.

* bpo-18109: os.uname() now decodes fields from the locale encoding,
  and socket.gethostname() now decodes the hostname from the locale
  encoding, instead of using the UTF-8 encoding in strict mode.

* bpo-18089: Implement importlib.abc.InspectLoader.load_module.

* bpo-18088: Introduce importlib.abc.Loader.init_module_attrs for
  setting module attributes. Leads to the pending deprecation of
  importlib.util.module_for_loader.

* bpo-17403: urllib.parse.robotparser normalizes the urls before
  adding to ruleline. This helps in handling certain types invalid
  urls in a conservative manner. Patch contributed by Mher Movsisyan.

* bpo-18070: Have importlib.util.module_for_loader() set attributes
  unconditionally in order to properly support reloading.

* Added importlib.util.module_to_load to return a context manager to
  provide the proper module object to load.

* bpo-18025: Fixed a segfault in io.BufferedIOBase.readinto() when
  raw stream's read() returns more bytes than requested.

* bpo-18011: As was originally intended, base64.b32decode() now
  raises a binascii.Error if there are non-b32-alphabet characters
  present in the input string, instead of a TypeError.

* bpo-18072: Implement importlib.abc.InspectLoader.get_code() and
  importlib.abc.ExecutionLoader.get_code().

* bpo-8240: Set the SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER flag on SSL
  sockets.

* bpo-17269: Workaround for socket.getaddrinfo crash on MacOS X with
  port None or "0" and flags AI_NUMERICSERV.

* bpo-16986: ElementTree now correctly works with string input when
  the internal XML encoding is not UTF-8 or US-ASCII.

* bpo-17996: socket module now exposes AF_LINK constant on BSD and
  OSX.

* bpo-17900: Allowed pickling of recursive OrderedDicts.  Decreased
  pickled size and pickling time.

* bpo-17914: Add os.cpu_count(). Patch by Yogesh Chaudhari, based on
  an initial patch by Trent Nelson.

* bpo-17812: Fixed quadratic complexity of base64.b32encode().
  Optimize base64.b32encode() and base64.b32decode() (speed up to 3x).

* bpo-17980: Fix possible abuse of ssl.match_hostname() for denial
  of service using certificates with many wildcards (CVE-2013-2099).

* bpo-15758: Fix FileIO.readall() so it no longer has O(n**2)
  complexity.

* bpo-14596: The struct.Struct() objects now use a more compact
  implementation.

* bpo-17981: logging's SysLogHandler now closes the socket when it
  catches socket OSErrors.

* bpo-17964: Fix os.sysconf(): the return type of the C sysconf()
  function is long, not int.

* Fix typos in the multiprocessing module.

* bpo-17754: Make ctypes.util.find_library() independent of the
  locale.

* bpo-17968: Fix memory leak in os.listxattr().

* bpo-17606: Fixed support of encoded byte strings in the
  XMLGenerator characters() and ignorableWhitespace() methods.
  Original patch by Sebastian Ortiz Vasquez.

* bpo-17732: Ignore distutils.cfg options pertaining to install
  paths if a virtual environment is active.

* bpo-17915: Fix interoperability of xml.sax with file objects
  returned by codecs.open().

* bpo-16601: Restarting iteration over tarfile really restarts
  rather than continuing from where it left off.  Patch by Michael
  Birtwell.

* bpo-17289: The readline module now plays nicer with external
  modules or applications changing the
  rl_completer_word_break_characters global variable.  Initial patch
  by Bradley Froehle.

* bpo-12181: select module: Fix struct kevent definition on OpenBSD
  64-bit platforms. Patch by Federico Schwindt.

* bpo-11816: multiple improvements to the dis module:
  get_instructions generator, ability to redirect output to a file,
  Bytecode and Instruction abstractions. Patch by Nick Coghlan, Ryan
  Kelly and Thomas Kluyver.

* bpo-13831: Embed stringification of remote traceback in local
  traceback raised when pool task raises an exception.

* bpo-15528: Add weakref.finalize to support finalization using
  weakref callbacks.

* bpo-14173: Avoid crashing when reading a signal handler during
  interpreter shutdown.

* bpo-15902: Fix imp.load_module() accepting None as a file when
  loading an extension module.

* bpo-13721: SSLSocket.getpeercert() and SSLSocket.do_handshake()
  now raise an OSError with ENOTCONN, instead of an AttributeError,
  when the SSLSocket is not connected.

* bpo-14679: add an __all__ (that contains only HTMLParser) to
  html.parser.

* bpo-17802: Fix an UnboundLocalError in html.parser.  Initial tests
  by Thomas Barlow.

* bpo-17358: Modules loaded by imp.load_source() and load_compiled()
  (and by extension load_module()) now have a better chance of working
  when reloaded.

* bpo-17804: New function "struct.iter_unpack" allows for streaming
  struct unpacking.

* bpo-17830: When keyword.py is used to update a keyword file, it
  now preserves the line endings of the original file.

* bpo-17272: Making the urllib.request's Request.full_url a
  descriptor. Fixes bugs with assignment to full_url. Patch by Demian
  Brecht.

* bpo-17353: Plistlib emitted empty data tags with deeply nested
  datastructures

* bpo-11714: Use 'with' statements to assure a Semaphore releases a
  condition variable. Original patch by Thomas Rachel.

* bpo-16624: "subprocess.check_output" now accepts an "input"
  argument, allowing the subprocess's stdin to be provided as a (byte)
  string. Patch by Zack Weinberg.

* bpo-17795: Reverted backwards-incompatible change in SysLogHandler
  with Unix domain sockets.

* bpo-16694: Add a pure Python implementation of the operator
  module. Patch by Zachary Ware.

* bpo-11182: remove the unused and undocumented pydoc.Scanner class.
  Patch by Martin Morrison.

* bpo-17741: Add ElementTree.XMLPullParser, an event-driven parser
  for non-blocking applications.

* bpo-17555: Fix ForkAwareThreadLock so that size of after fork
  registry does not grow exponentially with generation of process.

* bpo-17707: fix regression in multiprocessing.Queue's get() method
  where it did not block for short timeouts.

* bpo-17720: Fix the Python implementation of pickle.Unpickler to
  correctly process the APPENDS opcode when it is used on non-list
  objects.

* bpo-17012: shutil.which() no longer falls back to the PATH
  environment variable if an empty path argument is specified.  Patch
  by Serhiy Storchaka.

* bpo-17710: Fix pickle raising a SystemError on bogus input.

* bpo-17341: Include the invalid name in the error messages from re
  about invalid group names.

* bpo-17702: os.environ now raises KeyError with the original
  environment variable name (str on UNIX), instead of using the
  encoded name (bytes on UNIX).

* bpo-16163: Make the importlib based version of
  pkgutil.iter_importers work for submodules. Initial patch by Berker
  Peksag.

* bpo-16804: Fix a bug in the 'site' module that caused running
  'python -S -m site' to incorrectly throw an exception.

* bpo-15480: Remove the deprecated and unused TYPE_INT64 code from
  marshal. Initial patch by Daniel Riti.

* bpo-2118: SMTPException is now a subclass of OSError.

* bpo-17016: Get rid of possible pointer wraparounds and integer
  overflows in the re module.  Patch by Nickolai Zeldovich.

* bpo-16658: add missing return to HTTPConnection.send(). Patch by
  Jeff Knupp.

* bpo-9556: the logging package now allows specifying a time-of-day
  for a TimedRotatingFileHandler to rotate.

* bpo-14971: unittest test discovery no longer gets confused when a
  function has a different __name__ than its name in the TestCase
  class dictionary.

* bpo-17487: The wave getparams method now returns a namedtuple
  rather than a plain tuple.

* bpo-17675: socket repr() provides local and remote addresses (if
  any). Patch by Giampaolo Rodola'

* bpo-17093: Make the ABCs in importlib.abc provide default values
  or raise reasonable exceptions for their methods to make them more
  amenable to super() calls.

* bpo-17566: Make importlib.abc.Loader.module_repr() optional
  instead of an abstractmethod; now it raises NotImplementedError so
  as to be ignored by default.

* bpo-17678: Remove the use of deprecated method in
  http/cookiejar.py by changing the call to get_origin_req_host() to
  origin_req_host.

* bpo-17666: Fix reading gzip files with an extra field.

* bpo-16475: Support object instancing, recursion and interned
  strings in marshal

* bpo-17502: Process DEFAULT values in mock side_effect that returns
  iterator.

* bpo-16795: On the ast.arguments object, unify vararg with
  varargannotation and kwarg and kwargannotation. Change the column
  offset of ast.Attribute to be at the attribute name.

* bpo-17434: Properly raise a SyntaxError when a string occurs
  between future imports.

* bpo-17117: Import and @importlib.util.set_loader now set
  __loader__ when it has a value of None or the attribute doesn't
  exist.

* bpo-17032: The "global" in the "NameError: global name 'x' is not
  defined" error message has been removed.  Patch by Ram Rachum.

* bpo-18080: When building a C extension module on OS X, if the
  compiler is overridden with the CC environment variable, use the new
  compiler as the default for linking if LDSHARED is not also
  overridden.  This restores Distutils behavior introduced in 3.2.3
  and inadvertently dropped in 3.3.0.

* bpo-18113: Fixed a refcount leak in the curses.panel module's
  set_userptr() method. Reported by Atsuo Ishimoto.

* Implement PEP 443 "Single-dispatch generic functions".

* Implement PEP 435 "Adding an Enum type to the Python standard
  library".

* bpo-15596: Faster pickling of unicode strings.

* bpo-17572: Avoid chained exceptions when passing bad directives to
  time.strptime(). Initial patch by Claudiu Popa.

* bpo-17435: threading.Timer's __init__ method no longer uses
  mutable default values for the args and kwargs parameters.

* bpo-17526: fix an IndexError raised while passing code without
  filename to inspect.findsource().  Initial patch by Tyler Doyle.

* bpo-17540: Added style parameter to logging formatter
  configuration by dict.

* bpo-16692: The ssl module now supports TLS 1.1 and TLS 1.2.
  Initial patch by Michele Orrù.

* bpo-17025: multiprocessing: Reduce Queue and SimpleQueue
  contention.

* bpo-17536: Add to webbrowser's browser list: www-browser, x-www-
  browser, iceweasel, iceape.

* bpo-17150: pprint now uses line continuations to wrap long string
  literals.

* bpo-17488: Change the subprocess.Popen bufsize parameter default
  value from unbuffered (0) to buffering (-1) to match the behavior
  existing code expects and match the behavior of the subprocess
  module in Python 2 to avoid introducing hard to track down bugs.

* bpo-17521: Corrected non-enabling of logger following two calls to
  fileConfig().

* bpo-17508: Corrected logging MemoryHandler configuration in
  dictConfig() where the target handler wasn't configured first.

* bpo-17209: curses.window.get_wch() now correctly handles
  KeyboardInterrupt (CTRL+c).

* bpo-5713: smtplib now handles 421 (closing connection) error codes
  when sending mail by closing the socket and reporting the 421 error
  code via the exception appropriate to the command that received the
  error response.

* bpo-16997: unittest.TestCase now provides a subTest() context
  manager to procedurally generate, in an easy way, small test
  instances.

* bpo-17485: Also delete the Request Content-Length header if the
  data attribute is deleted.  (Follow on to issue bpo-16464).

* bpo-15927: CVS now correctly parses escaped newlines and carriage
  when parsing with quoting turned off.

* bpo-17467: add readline and readlines support to mock_open in
  unittest.mock.

* bpo-13248: removed deprecated and undocumented difflib.isbjunk,
  isbpopular.

* bpo-17192: Update the ctypes module's libffi to v3.0.13.  This
  specifically addresses a stack misalignment issue on x86 and issues
  on some more recent platforms.

* bpo-8862: Fixed curses cleanup when getkey is interrupted by a
  signal.

* bpo-17443: imaplib.IMAP4_stream was using the default unbuffered
  IO in subprocess, but the imap code assumes buffered IO.  In Python2
  this worked by accident. IMAP4_stream now explicitly uses buffered
  IO.

* bpo-17476: Fixed regression relative to Python2 in undocumented
  pydoc 'allmethods'; it was missing unbound methods on the class.

* bpo-17474: Remove the deprecated methods of Request class.

* bpo-16709: unittest discover order is no-longer filesystem
  specific. Patch by Jeff Ramnani.

* Use the HTTPS PyPI url for upload, overriding any plain HTTP URL
  in pypirc.

* bpo-5024: sndhdr.whichhdr now returns the frame count for WAV
  files rather than -1.

* bpo-17460: Remove the strict argument of HTTPConnection and
  removing the DeprecationWarning being issued from 3.2 onwards.

* bpo-16880: Do not assume _imp.load_dynamic() is defined in the imp
  module.

* bpo-16389: Fixed a performance regression relative to Python 3.1
  in the caching of compiled regular expressions.

* Added missing FeedParser and BytesFeedParser to
  email.parser.__all__.

* bpo-17431: Fix missing import of BytesFeedParser in email.parser.

* bpo-12921: http.server's send_error takes an explain argument to
  send more information in response. Patch contributed by Karl.

* bpo-17414: Add timeit, repeat, and default_timer to
  timeit.__all__.

* bpo-1285086: Get rid of the refcounting hack and speed up
  urllib.parse.unquote() and urllib.parse.unquote_to_bytes().

* bpo-17099: Have importlib.find_loader() raise ValueError when
  __loader__ is not set, harmonizing with what happens when the
  attribute is set to None.

* Expose the O_PATH constant in the os module if it is available.

* bpo-17368: Fix an off-by-one error in the Python JSON decoder that
  caused a failure while decoding empty object literals when
  object_pairs_hook was specified.

* bpo-17385: Fix quadratic behavior in threading.Condition.  The
  FIFO queue now uses a deque instead of a list.

* bpo-15806: Add contextlib.ignore().  This creates a context
  manager to ignore specified exceptions, replacing the "except
  SomeException: pass" idiom.

* bpo-14645: The email generator classes now produce output using
  the specified linesep throughout.  Previously if the prolog, epilog,
  or body were stored with a different linesep, that linesep was used.
  This fix corrects an RFC non- compliance issue with
  smtplib.send_message.

* bpo-17278: Fix a crash in heapq.heappush() and heapq.heappop()
  when the list is being resized concurrently.

* bpo-16962: Use getdents64 instead of the obsolete getdents syscall
  in the subprocess module on Linux.

* bpo-16935: unittest now counts the module as skipped if it raises
  SkipTest, instead of counting it as an error.  Patch by Zachary
  Ware.

* bpo-17018: Make Process.join() retry if os.waitpid() fails with
  EINTR.

* bpo-17223: array module: Fix a crasher when converting an array
  containing invalid characters (outside range [U+0000; U+10ffff]) to
  Unicode: repr(array), str(array) and array.tounicode(). Patch
  written by Manuel Jacob.

* bpo-17197: profile/cProfile modules refactored so that code of
  run() and runctx() utility functions is not duplicated in both
  modules.

* bpo-14720: sqlite3: Convert datetime microseconds correctly. Patch
  by Lowe Thiderman.

* bpo-15132: Allow a list for the defaultTest argument of
  unittest.TestProgram. Patch by Jyrki Pulliainen.

* bpo-17225: JSON decoder now counts columns in the first line
  starting with 1, as in other lines.

* bpo-6623: Added explicit DeprecationWarning for ftplib.netrc,
  which has been deprecated and undocumented for a long time.

* bpo-13700: Fix byte/string handling in imaplib authentication when
  an authobject is specified.

* bpo-13153: Tkinter functions now raise TclError instead of
  ValueError when a string argument contains non-BMP character.

* bpo-9669: Protect re against infinite loops on zero-width matching
  in non-greedy repeat.  Patch by Matthew Barnett.

* bpo-13169: The maximal repetition number in a regular expression
  has been increased from 65534 to 2147483647 (on 32-bit platform) or
  4294967294 (on 64-bit).

* bpo-17143: Fix a missing import in the trace module.  Initial
  patch by Berker Peksag.

* bpo-15220: email.feedparser's line splitting algorithm is now
  simpler and faster.

* bpo-16743: Fix mmap overflow check on 32 bit Windows.

* bpo-16996: webbrowser module now uses shutil.which() to find a
  web- browser on the executable search path.

* bpo-16800: tempfile.gettempdir() no longer left temporary files
  when the disk is full. Original patch by Amir Szekely.

* bpo-17192: Import libffi-3.0.12.

* bpo-16564: Fixed regression relative to Python2 in the operation
  of email.encoders.encode_7or8bit when used with binary data.

* bpo-17052: unittest discovery should use self.testLoader.

* bpo-4591: Uid and gid values larger than 2**31 are supported now.

* bpo-17141: random.vonmisesvariate() no longer hangs for large
  kappas.

* bpo-17149: Fix random.vonmisesvariate to always return results in
  [0, 2*math.pi].

* bpo-1470548: XMLGenerator now works with binary output streams.

* bpo-6975: os.path.realpath() now correctly resolves multiple
  nested symlinks on POSIX platforms.

* bpo-13773: sqlite3.connect() gets a new "uri" parameter to pass
  the filename as a URI, allowing custom options to be passed.

* bpo-16564: Fixed regression relative to Python2 in the operation
  of email.encoders.encode_noop when used with binary data.

* bpo-10355: The mode, name, encoding and newlines properties now
  work on SpooledTemporaryFile objects even when they have not yet
  rolled over. Obsolete method xreadline (which has never worked in
  Python 3) has been removed.

* bpo-16686: Fixed a lot of bugs in audioop module.  Fixed crashes
  in avgpp(), maxpp() and ratecv().  Fixed an integer overflow in
  add(), bias(), and ratecv(). reverse(), lin2lin() and ratecv() no
  more lose precision for 32-bit samples. max() and rms() no more
  returns a negative result and various other functions now work
  correctly with 32-bit sample -0x80000000.

* bpo-17073: Fix some integer overflows in sqlite3 module.

* bpo-16723: httplib.HTTPResponse no longer marked closed when the
  connection is automatically closed.

* bpo-15359: Add CAN_BCM protocol support to the socket module.
  Patch by Brian Thorne.

* bpo-16948: Fix quoted printable body encoding for non-latin1
  character sets in the email package.

* bpo-16811: Fix folding of headers with no value in the provisional
  email policies.

* bpo-17132: Update symbol for "yield from" grammar changes.

* bpo-17076: Make copying of xattrs more tolerant of missing FS
  support. Patch by Thomas Wouters.

* bpo-17089: Expat parser now correctly works with string input when
  the internal XML encoding is not UTF-8 or US-ASCII.  It also now
  accepts bytes and strings larger than 2 GiB.

* bpo-6083: Fix multiple segmentation faults occurred when
  PyArg_ParseTuple parses nested mutating sequence.

* bpo-5289: Fix ctypes.util.find_library on Solaris.

* bpo-17106: Fix a segmentation fault in io.TextIOWrapper when an
  underlying stream or a decoder produces data of an unexpected type
  (i.e. when io.TextIOWrapper initialized with text stream or use
  bytes-to-bytes codec).

* bpo-17015: When it has a spec, a Mock object now inspects its
  signature when matching calls, so that arguments can be matched
  positionally or by name.

* bpo-15633: httplib.HTTPResponse is now mark closed when the server
  sends less than the advertised Content-Length.

* bpo-12268: The io module file object write methods no longer abort
  early when one of its write system calls is interrupted (EINTR).

* bpo-6972: The zipfile module no longer overwrites files outside of
  its destination path when extracting malicious zip files.

* bpo-4844: ZipFile now raises BadZipFile when opens a ZIP file with
  an incomplete "End of Central Directory" record.  Original patch by
  Guilherme Polo and Alan McIntyre.

* bpo-17071: Signature.bind() now works when one of the keyword
  arguments is named "self".

* bpo-12004: Fix an internal error in PyZipFile when writing an
  invalid Python file. Patch by Ben Morgan.

* Have py_compile use importlib as much as possible to avoid code
  duplication. Code now raises FileExistsError if the file path to be
  used for the byte- compiled file is a symlink or non-regular file as
  a warning that import will not keep the file path type if it writes
  to that path.

* bpo-16972: Have site.addpackage() consider already known paths
  even when none are explicitly passed in. Bug report and fix by
  Kirill.

* bpo-1602133: on Mac OS X a shared library build ("--enable-
  shared") now fills the "os.environ" variable correctly.

* bpo-15505: "unittest.installHandler" no longer assumes SIGINT
  handler is set to a callable object.

* bpo-13454: Fix a crash when deleting an iterator created by
  itertools.tee() if all other iterators were very advanced before.

* bpo-12411: Fix to cgi.parse_multipart to correctly use bytes
  boundaries and bytes data. Patch by Jonas Wagner.

* bpo-16957: shutil.which() no longer searches a bare file name in
  the current directory on Unix and no longer searches a relative file
  path with a directory part in PATH directories.  Patch by Thomas
  Kluyver.

* bpo-1159051: GzipFile now raises EOFError when reading a corrupted
  file with truncated header or footer.

* bpo-16993: shutil.which() now preserves the case of the path and
  extension on Windows.

* bpo-16992: On Windows in signal.set_wakeup_fd, validate the file
  descriptor argument.

* bpo-16422: For compatibility with the Python version, the C
  version of decimal now uses strings instead of integers for rounding
  mode constants.

* bpo-15861: tkinter now correctly works with lists and tuples
  containing strings with whitespaces, backslashes or unbalanced
  braces.

* bpo-9720: zipfile now writes correct local headers for files
  larger than 4 GiB.

* bpo-16955: Fix the poll() method for multiprocessing's socket
  connections on Windows.

* SSLContext.load_dh_params() now properly closes the input file.

* bpo-15031: Refactor some .pyc management code to cut down on code
  duplication. Thanks to Ronan Lamy for the report and taking an
  initial stab at the problem.

* bpo-16398: Optimize deque.rotate() so that it only moves pointers
  and doesn't touch the underlying data with increfs and decrefs.

* bpo-16900: Issue a ResourceWarning when an ssl socket is left
  unclosed.

* bpo-13899: "\A", "\Z", and "\B" now correctly match the A, Z, and
  B literals when used inside character classes (e.g. "'[\A]'"). Patch
  by Matthew Barnett.

* bpo-15545: Fix regression in sqlite3's iterdump method where it
  was failing if the connection used a row factory (such as
  sqlite3.Row) that produced unsortable objects. (Regression was
  introduced by fix for 9750).

* fcntl: add F_DUPFD_CLOEXEC constant, available on Linux 2.6.24+.

* bpo-15972: Fix error messages when os functions expecting a file
  name or file descriptor receive the incorrect type.

* bpo-8109: The ssl module now has support for server-side SNI,
  thanks to a "SSLContext.set_servername_callback()" method.  Patch by
  Daniel Black.

* bpo-16860: In tempfile, use O_CLOEXEC when available to set the
  close-on-exec flag atomically.

* bpo-16674: random.getrandbits() is now 20-40% faster for small
  integers.

* bpo-16009: JSON error messages now provide more information.

* bpo-16828: Fix error incorrectly raised by bz2.compress(b'') and
  bz2.BZ2Compressor.compress(b''). Initial patch by Martin Packman.

* bpo-16833: In http.client.HTTPConnection, do not concatenate the
  request headers and body when the payload exceeds 16 KB, since it
  can consume more memory for no benefit.  Patch by Benno Leslie.

* bpo-16541: tk_setPalette() now works with keyword arguments.

* bpo-16820: In configparser, "parser.popitem()" no longer raises
  ValueError. This makes "parser.clean()" work correctly.

* bpo-16820: In configparser, "parser['section'] = {}" now preserves
  section order within the parser. This makes "parser.update()"
  preserve section order as well.

* bpo-16820: In configparser, "parser['DEFAULT'] = {}" now correctly
  clears previous values stored in the default section. Same goes for
  "parser.update({'DEFAULT': {}})".

* bpo-9586: Redefine SEM_FAILED on MacOSX to keep compiler happy.

* bpo-16787: Increase asyncore and asynchat default output buffers
  size, to decrease CPU usage and increase throughput.

* bpo-10527: make multiprocessing use poll() instead of select() if
  available.

* bpo-16688: Now regexes contained backreferences correctly work
  with non-ASCII strings. Patch by Matthew Barnett.

* bpo-16486: Make aifc files act as context managers.

* bpo-16485: Now file descriptors are closed if file header patching
  failed on closing an aifc file.

* bpo-16640: Run less code under a lock in sched module.

* bpo-16165: sched.scheduler.run() no longer blocks a scheduler for
  other threads.

* bpo-16641: Default values of sched.scheduler.enter() are no longer
  modifiable.

* bpo-16618: Make glob.glob match consistently across strings and
  bytes regarding leading dots.  Patch by Serhiy Storchaka.

* bpo-16788: Add samestat to Lib/ntpath.py

* bpo-16713: Parsing of 'tel' urls using urlparse separates params
  from path.

* bpo-16443: Add docstrings to regular expression match objects.
  Patch by Anton Kasyanov.

* bpo-15701: Fix HTTPError info method call to return the headers
  information.

* bpo-16752: Add a missing import to modulefinder. Patch by Berker
  Peksag.

* bpo-16646: ftplib.FTP.makeport() might lose socket error details.
  (patch by Serhiy Storchaka)

* bpo-16626: Fix infinite recursion in glob.glob() on Windows when
  the pattern contains a wildcard in the drive or UNC path.  Patch by
  Serhiy Storchaka.

* bpo-15783: Except for the number methods, the C version of decimal
  now supports all None default values present in decimal.py. These
  values were largely undocumented.

* bpo-11175: argparse.FileType now accepts encoding and errors
  arguments. Patch by Lucas Maystre.

* bpo-16488: epoll() objects now support the "with" statement.
  Patch by Serhiy Storchaka.

* bpo-16298: In HTTPResponse.read(), close the socket when there is
  no Content-Length and the incoming stream is finished.  Patch by
  Eran Rundstein.

* bpo-16049: Add abc.ABC class to enable the use of inheritance to
  create ABCs, rather than the more cumbersome metaclass=ABCMeta.
  Patch by Bruno Dupuis.

* Expose the TCP_FASTOPEN and MSG_FASTOPEN flags in socket when
  they're available.

* bpo-15701: Add a .headers attribute to urllib.error.HTTPError.
  Patch contributed by Berker Peksag.

* bpo-15872: Fix 3.3 regression introduced by the new fd-based
  shutil.rmtree that caused it to not ignore certain errors when
  ignore_errors was set. Patch by Alessandro Moura and Serhiy
  Storchaka.

* bpo-16248: Disable code execution from the user's home directory
  by tkinter when the -E flag is passed to Python.  Patch by Zachary
  Ware.

* bpo-13390: New function "sys.getallocatedblocks()" returns the
  number of memory blocks currently allocated.

* bpo-16628: Fix a memory leak in ctypes.resize().

* bpo-13614: Fix setup.py register failure with invalid rst in
  description. Patch by Julien Courteau and Pierre Paul Lefebvre.

* bpo-13512: Create ~/.pypirc securely (CVE-2011-4944).  Initial
  patch by Philip Jenvey, tested by Mageia and Debian.

* bpo-7719: Make distutils ignore ".nfs*" files instead of choking
  later on.  Initial patch by SilentGhost and Jeff Ramnani.

* bpo-13120: Allow calling pdb.set_trace() from thread. Patch by
  Ilya Sandler.

* bpo-16585: Make CJK encoders support error handlers that return
  bytes per PEP 383.

* bpo-10182: The re module doesn't truncate indices to 32 bits
  anymore. Patch by Serhiy Storchaka.

* bpo-16333: use (",", ": ") as default separator in json when
  indent is specified, to avoid trailing whitespace.  Patch by Serhiy
  Storchaka.

* bpo-16573: In 2to3, treat enumerate() like a consuming call, so
  superfluous list() calls aren't added to filter(), map(), and zip()
  which are directly passed enumerate().

* bpo-16464: Reset the Content-Length header when a urllib Request
  is reused with new data.

* bpo-12848: The pure Python pickle implementation now treats object
  lengths as unsigned 32-bit integers, like the C implementation does.
  Patch by Serhiy Storchaka.

* bpo-16423: urllib.request now has support for "data:" URLs.  Patch
  by Mathias Panzenböck.

* bpo-4473: Add a POP3.stls() to switch a clear-text POP3 session
  into an encrypted POP3 session, on supported servers.  Patch by
  Lorenzo Catucci.

* bpo-4473: Add a POP3.capa() method to query the capabilities
  advertised by the POP3 server.  Patch by Lorenzo Catucci.

* bpo-4473: Ensure the socket is shutdown cleanly in POP3.close().
  Patch by Lorenzo Catucci.

* bpo-16522: added FAIL_FAST flag to doctest.

* bpo-15627: Add the importlib.abc.InspectLoader.source_to_code()
  method.

* bpo-16408: Fix file descriptors not being closed in error
  conditions in the zipfile module.  Patch by Serhiy Storchaka.

* bpo-14631: Add a new "weakref.WeakMethod" to simulate weak
  references to bound methods.

* bpo-16469: Fix exceptions from float -> Fraction and Decimal ->
  Fraction conversions for special values to be consistent with those
  for float -> int and Decimal -> int.  Patch by Alexey Kachayev.

* bpo-16481: multiprocessing no longer leaks process handles on
  Windows.

* bpo-12428: Add a pure Python implementation of
  functools.partial(). Patch by Brian Thorne.

* bpo-16140: The subprocess module no longer double closes its child
  subprocess.PIPE parent file descriptors on child error prior to
  exec().

* Remove a bare print to stdout from the subprocess module that
  could have happened if the child process wrote garbage to its pre-
  exec error pipe.

* The subprocess module now raises its own SubprocessError instead
  of a RuntimeError in various error situations which should not
  normally happen.

* bpo-16327: The subprocess module no longer leaks file descriptors
  used for stdin/stdout/stderr pipes to the child when fork() fails.

* bpo-14396: Handle the odd rare case of waitpid returning 0 when
  not expected in subprocess.Popen.wait().

* bpo-16411: Fix a bug where zlib.decompressobj().flush() might try
  to access previously- freed memory. Patch by Serhiy Storchaka.

* bpo-16357: fix calling accept() on a SSLSocket created through
  SSLContext.wrap_socket().  Original patch by Jeff McNeil.

* bpo-16409: The reporthook callback made by the legacy
  urllib.request.urlretrieve API now properly supplies a constant non-
  zero block_size as it did in Python 3.2 and 2.7.  This matches the
  behavior of urllib.request.URLopener.retrieve.

* bpo-16431: Use the type information when constructing a Decimal
  subtype from a Decimal argument.

* bpo-15641: Clean up deprecated classes from importlib. Patch by
  Taras Lyapun.

* bpo-16350: zlib.decompressobj().decompress() now accumulates data
  from successive calls after EOF in unused_data, instead of only
  saving the argument to the last call. decompressobj().flush() now
  correctly sets unused_data and unconsumed_tail. A bug in the
  handling of MemoryError when setting the unconsumed_tail attribute
  has also been fixed. Patch by Serhiy Storchaka.

* bpo-12759: sre_parse now raises a proper error when the name of
  the group is missing. Initial patch by Serhiy Storchaka.

* bpo-16152: fix tokenize to ignore whitespace at the end of the
  code when no newline is found.  Patch by Ned Batchelder.

* bpo-16284: Prevent keeping unnecessary references to worker
  functions in concurrent.futures ThreadPoolExecutor.

* bpo-16230: Fix a crash in select.select() when one of the lists
  changes size while iterated on.  Patch by Serhiy Storchaka.

* bpo-16228: Fix a crash in the json module where a list changes
  size while it is being encoded.  Patch by Serhiy Storchaka.

* bpo-16351: New function gc.get_stats() returns per-generation
  collection statistics.

* bpo-14897: Enhance error messages of struct.pack and
  struct.pack_into. Patch by Matti Mäki.

* bpo-16316: mimetypes now recognizes the .xz and .txz (.tar.xz)
  extensions. Patch by Serhiy Storchaka.

* bpo-12890: cgitb no longer prints spurious <p> tags in text mode
  when the logdir option is specified.

* bpo-16307: Fix multiprocessing.Pool.map_async not calling its
  callbacks. Patch by Janne Karila.

* bpo-16305: Fix a segmentation fault occurring when interrupting
  math.factorial.

* bpo-16116: Fix include and library paths to be correct when
  building C extensions in venvs.

* bpo-16245: Fix the value of a few entities in html.entities.html5.

* bpo-16301: Fix the localhost verification in urllib/request.py for
  "file://" urls.

* bpo-16250: Fix the invocations of URLError which had misplaced
  filename attribute for exception.

* bpo-10836: Fix exception raised when file not found in urlretrieve
  Initial patch by Ezio Melotti.

* bpo-14398: Fix size truncation and overflow bugs in the bz2
  module.

* bpo-12692: Fix resource leak in urllib.request when talking to an
  HTTP server that does not include a "Connection: close" header in
  its responses.

* bpo-12034: Fix bogus caching of result in
  check_GetFinalPathNameByHandle. Patch by Atsuo Ishimoto.

* Improve performance of "lzma.LZMAFile" (see also bpo-16034).

* bpo-16220: wsgiref now always calls close() on an iterable
  response. Patch by Brent Tubbs.

* bpo-16270: urllib may hang when used for retrieving files via FTP
  by using a context manager.  Patch by Giampaolo Rodola'.

* bpo-16461: Wave library should be able to deal with 4GB wav files,
  and sample rate of 44100 Hz.

* bpo-16176: Properly identify Windows 8 via platform.platform()

* bpo-16088: BaseHTTPRequestHandler's send_error method includes a
  Content-Length header in its response now. Patch by Antoine Pitrou.

* bpo-16114: The subprocess module no longer provides a misleading
  error message stating that args[0] did not exist when either the cwd
  or executable keyword arguments specified a path that did not exist.

* bpo-16169: Fix ctypes.WinError()'s confusion between errno and
  winerror.

* bpo-16110: logging.fileConfig now accepts a pre-initialised
  ConfigParser instance.

* bpo-1492704: shutil.copyfile() raises a distinct SameFileError now
  if source and destination are the same file. Patch by Atsuo
  Ishimoto.

* bpo-13896: Make shelf instances work with 'with' as context
  managers. Original patch by Filip Gruszczyński.

* bpo-15417: Add support for csh and fish in venv activation
  scripts.

* bpo-14377: ElementTree.write and some of the module-level
  functions have a new parameter - *short_empty_elements*. It controls
  how elements with no contents are emitted.

* bpo-16089: Allow ElementTree.TreeBuilder to work again with a non-
  Element element_factory (fixes a regression in SimpleTAL).

* bpo-9650: List commonly used format codes in time.strftime and
  time.strptime docsttings.  Original patch by Mike Hoy.

* bpo-15452: logging configuration socket listener now has a verify
  option that allows an application to apply a verification function
  to the received configuration data before it is acted upon.

* bpo-16034: Fix performance regressions in the new "bz2.BZ2File"
  implementation. Initial patch by Serhiy Storchaka.

* "pty.spawn()" now returns the child process status returned by
  "os.waitpid()".

* bpo-15756: "subprocess.poll()" now properly handles "errno.ECHILD"
  to return a returncode of 0 when the child has already exited or
  cannot be waited on.

* bpo-15323: Improve failure message of
  "Mock.assert_called_once_with()".

* bpo-16064: "unittest -m" claims executable is "python", not
  "python3".

* bpo-12376: Pass on parameters in "TextTestResult.__init__()" super
  call.

* bpo-15222: Insert blank line after each message in mbox mailboxes.

* bpo-16013: Fix "csv.Reader" parsing issue with ending quote
  characters. Patch by Serhiy Storchaka.

* bpo-15421: Fix an OverflowError in "Calendar.itermonthdates()"
  after "datetime.MAXYEAR".  Patch by Cédric Krier.

* bpo-16112: platform.architecture does not correctly escape
  argument to /usr/bin/file. Patch by David Benjamin.

* bpo-15970: "xml.etree.ElementTree" now serializes correctly the
  empty HTML elements 'meta' and 'param'.

* bpo-15842: The "SocketIO.{readable,writable,seekable}" methods now
  raise ValueError when the file-like object is closed.  Patch by
  Alessandro Moura.

* bpo-15876: Fix a refleak in the "curses" module: window.encoding.

* bpo-15881: Fix "atexit" hook in "multiprocessing".  Original patch
  by Chris McDonough.

* bpo-15841: The readable(), writable() and seekable() methods of
  "io.BytesIO" and "io.StringIO" objects now raise ValueError when the
  object has been closed. Patch by Alessandro Moura.

* bpo-15447: Use "subprocess.DEVNULL" in webbrowser, instead of
  opening "os.devnull" explicitly and leaving it open.

* bpo-15509: "webbrowser.UnixBrowser" no longer passes empty
  arguments to Popen when "%action" substitutions produce empty
  strings.

* bpo-12776: Call "argparse" type function (specified by
  add_argument) only once. Before, the type function was called twice
  in the case where the default was specified and the argument was
  given as well. This was especially problematic for the FileType
  type, as a default file would always be opened, even if a file
  argument was specified on the command line. (See also: bpo-11839)

* bpo-15906: Fix a regression in argparse caused by the preceding
  change, when "action='append'", "type='str'" and "default=[]".

* bpo-16113: Added sha3 module based on the Keccak reference
  implementation 3.2. The "hashlib" module has four additional hash
  algorithms: "sha3_224", "sha3_256", "sha3_384" and "sha3_512". As
  part of the patch some common code was moved from _hashopenssl.c to
  hashlib.h.

* ctypes.call_commethod was removed, since its only usage was in the
  defunct samples directory.

* bpo-16692: Added TLSv1.1 and TLSv1.2 support for the ssl modules.

* bpo-16832: add abc.get_cache_token() to expose cache validity
  checking support in ABCMeta.


IDLE
----

* bpo-18429: Format / Format Paragraph, now works when comment
  blocks are selected. As with text blocks, this works best when the
  selection only includes complete lines.

* bpo-18226: Add docstrings and unittests for FormatParagraph.py.
  Original patches by Todd Rovito and Phil Webster.

* bpo-18279: Format - Strip trailing whitespace no longer marks a
  file as changed when it has not been changed. This fix followed the
  addition of a test file originally written by Phil Webster (the
  issue's main goal).

* bpo-7136: In the Idle File menu, "New Window" is renamed "New
  File". Patch by Tal Einat, Roget Serwy, and Todd Rovito.

* Remove dead imports of imp.

* bpo-18196: Avoid displaying spurious SystemExit tracebacks.

* bpo-5492: Avoid traceback when exiting IDLE caused by a race
  condition.

* bpo-17511: Keep IDLE find dialog open after clicking "Find Next".
  Original patch by Sarah K.

* bpo-18055: Move IDLE off of imp and on to importlib.

* bpo-15392: Create a unittest framework for IDLE. Initial patch by
  Rajagopalasarma Jayakrishnan. See Lib/idlelib/idle_test/README.txt
  for how to run Idle tests.

* bpo-14146: Highlight source line while debugging on Windows.

* bpo-17838: Allow sys.stdin to be reassigned.

* bpo-13495: Avoid loading the color delegator twice in IDLE.

* bpo-17798: Allow IDLE to edit new files when specified on command
  line.

* bpo-14735: Update IDLE docs to omit "Control-z on Windows".

* bpo-17532: Always include Options menu for IDLE on OS X. Patch by
  Guilherme Simões.

* bpo-17585: Fixed IDLE regression. Now closes when using exit() or
  quit().

* bpo-17657: Show full Tk version in IDLE's about dialog. Patch by
  Todd Rovito.

* bpo-17613: Prevent traceback when removing syntax colorizer in
  IDLE.

* bpo-1207589: Backwards-compatibility patch for right-click menu in
  IDLE.

* bpo-16887: IDLE now accepts Cancel in tabify/untabify dialog box.

* bpo-17625: In IDLE, close the replace dialog after it is used.

* bpo-14254: IDLE now handles readline correctly across shell
  restarts.

* bpo-17614: IDLE no longer raises exception when quickly closing a
  file.

* bpo-6698: IDLE now opens just an editor window when configured to
  do so.

* bpo-8900: Using keyboard shortcuts in IDLE to open a file no
  longer raises an exception.

* bpo-6649: Fixed missing exit status in IDLE. Patch by Guilherme
  Polo.

* bpo-17114: IDLE now uses non-strict config parser.

* bpo-9290: In IDLE the sys.std* streams now implement io.TextIOBase
  interface and support all mandatory methods and properties.

* bpo-5066: Update IDLE docs. Patch by Todd Rovito.

* bpo-16829: IDLE printing no longer fails if there are spaces or
  other special characters in the file path.

* bpo-16491: IDLE now prints chained exception tracebacks.

* bpo-16819: IDLE method completion now correctly works for bytes
  literals.

* bpo-16504: IDLE now catches SyntaxErrors raised by tokenizer.
  Patch by Roger Serwy.

* bpo-16511: Use default IDLE width and height if config param is
  not valid. Patch Serhiy Storchaka.

* bpo-1207589: Add Cut/Copy/Paste items to IDLE right click Context
  Menu. Patch by Todd Rovito.

* bpo-16123: IDLE - deprecate running without a subprocess. Patch by
  Roger Serwy.


Tests
-----

* bpo-1666318: Add a test that shutil.copytree() retains directory
  permissions.  Patch by Catherine Devlin.

* bpo-18273: move the tests in Lib/test/json_tests to
  Lib/test/test_json and make them discoverable by unittest.  Patch by
  Zachary Ware.

* Fix a fcntl test case on KFreeBSD, Debian #708653 (Petr Salinger).

* bpo-18396: Fix spurious test failure in test_signal on Windows
  when faulthandler is enabled (Patch by Jeremy Kloth)

* bpo-17046: Fix broken test_executable_without_cwd in
  test_subprocess.

* bpo-15415: Add new temp_dir() and change_cwd() context managers to
  test.support, and refactor temp_cwd() to use them.  Patch by Chris
  Jerdonek.

* bpo-15494: test.support is now a package rather than a module
  (Initial patch by Indra Talip)

* bpo-17944: test_zipfile now discoverable and uses subclassing to
  generate tests for different compression types.  Fixed a bug with
  skipping some tests due to use of exhausted iterators.

* bpo-18266: test_largefile now works with unittest test discovery
  and supports running only selected tests.  Patch by Zachary Ware.

* bpo-17767: test_locale now works with unittest test discovery.
  Original patch by Zachary Ware.

* bpo-18375: Assume --randomize when --randseed is used for running
  the testsuite.

* bpo-11185: Fix test_wait4 under AIX.  Patch by Sébastien Sablé.

* bpo-18207: Fix test_ssl for some versions of OpenSSL that ignore
  seconds in ASN1_TIME fields.

* bpo-18094: test_uuid no longer reports skipped tests as passed.

* bpo-17992: Add timeouts to asyncore and asynchat tests so that
  they won't accidentally hang.

* bpo-17833: Fix test_gdb failures seen on machines where debug
  symbols for glibc are available (seen on PPC64 Linux).

* bpo-7855: Add tests for ctypes/winreg for issues found in
  IronPython. Initial patch by Dino Viehland.

* bpo-11078: test___all__ now checks for duplicates in __all__.
  Initial patch by R. David Murray.

* bpo-17712: Fix test_gdb failures on Ubuntu 13.04.

* bpo-17835: Fix test_io when the default OS pipe buffer size is
  larger than one million bytes.

* bpo-17065: Use process-unique key for winreg tests to avoid
  failures if test is run multiple times in parallel (eg: on a
  buildbot host).

* bpo-12820: add tests for the xml.dom.minicompat module. Patch by
  John Chandler and Phil Connell.

* bpo-17691: test_univnewlines now works with unittest test
  discovery. Patch by Zachary Ware.

* bpo-17790: test_set now works with unittest test discovery. Patch
  by Zachary Ware.

* bpo-17789: test_random now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-17779: test_osx_env now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-17766: test_iterlen now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-17690: test_time now works with unittest test discovery. Patch
  by Zachary Ware.

* bpo-17692: test_sqlite now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-11995: test_pydoc doesn't import all sys.path modules anymore.

* bpo-17448: test_sax now skips if there are no xml parsers
  available instead of raising an ImportError.

* bpo-11420: make test suite pass with -B/DONTWRITEBYTECODE set.
  Initial patch by Thomas Wouters.

* bpo-10652: make tcl/tk tests run after __all__ test, patch by
  Zachary Ware.

* bpo-11963: remove human verification from test_parser and
  test_subprocess.

* bpo-11732: add a new suppress_crash_popup() context manager to
  test.support that disables crash popups on Windows and use it in
  test_faulthandler and test_capi.

* bpo-13898: test_ssl no longer prints a spurious stack trace on
  Ubuntu.

* bpo-17283: Share code between "__main__.py" and "regrtest.py" in
  "Lib/test".

* bpo-17249: convert a test in test_capi to use unittest and reap
  threads.

* bpo-17107: Test client-side SNI support in urllib.request thanks
  to the new server-side SNI support in the ssl module.  Initial patch
  by Daniel Black.

* bpo-17041: Fix testing when Python is configured with the
  --without- doc-strings.

* bpo-16923: Fix ResourceWarnings in test_ssl.

* bpo-15539: Added regression tests for Tools/scripts/pindent.py.

* bpo-17479: test_io now works with unittest test discovery. Patch
  by Zachary Ware.

* bpo-17066: test_robotparser now works with unittest test
  discovery. Patch by Zachary Ware.

* bpo-17334: test_index now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-17333: test_imaplib now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-17082: test_dbm* now work with unittest test discovery. Patch
  by Zachary Ware.

* bpo-17079: test_ctypes now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-17304: test_hash now works with unittest test discovery. Patch
  by Zachary Ware.

* bpo-17303: test_future* now work with unittest test discovery.
  Patch by Zachary Ware.

* bpo-17163: test_file now works with unittest test discovery. Patch
  by Zachary Ware.

* bpo-16925: test_configparser now works with unittest test
  discovery. Patch by Zachary Ware.

* bpo-16918: test_codecs now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-16919: test_crypt now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-16910: test_bytes, test_unicode, and test_userstring now work
  with unittest test discovery.  Patch by Zachary Ware.

* bpo-16905: test_warnings now works with unittest test discovery.
  Initial patch by Berker Peksag.

* bpo-16898: test_bufio now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-16888: test_array now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-16896: test_asyncore now works with unittest test discovery.
  Patch by Zachary Ware.

* bpo-16897: test_bisect now works with unittest test discovery.
  Initial patch by Zachary Ware.

* bpo-16852: test_genericpath, test_posixpath, test_ntpath, and
  test_macpath now work with unittest test discovery.  Patch by
  Zachary Ware.

* bpo-16748: test_heapq now works with unittest test discovery.

* bpo-10646: Tests rearranged for os.samefile/samestat to check for
  not just symlinks but also hard links.

* bpo-15302: Switch regrtest from using getopt to using argparse.

* bpo-15324: Fix regrtest parsing of --fromfile, --match, and
  --randomize options.

* bpo-16702: test_urllib2_localnet tests now correctly ignores
  proxies for localhost tests.

* bpo-16664: Add regression tests for glob's behaviour concerning
  entries starting with a ".".  Patch by Sebastian Kreft.

* bpo-13390: The "-R" option to regrtest now also checks for memory
  allocation leaks, using "sys.getallocatedblocks()".

* bpo-16559: Add more tests for the json module, including some from
  the official test suite at json.org.  Patch by Serhiy Storchaka.

* bpo-16661: Fix the "os.getgrouplist()" test by not assuming that
  it gives the same output as **id -G**.

* bpo-16115: Add some tests for the executable argument to
  subprocess.Popen().  Initial patch by Kushal Das.

* bpo-16126: PyErr_Format format mismatch in _testcapimodule.c.
  Patch by Serhiy Storchaka.

* bpo-15304: Fix warning message when "os.chdir()" fails inside
  "test.support.temp_cwd()".  Patch by Chris Jerdonek.

* bpo-15802: Fix test logic in "TestMaildir.test_create_tmp()".
  Patch by Serhiy Storchaka.

* bpo-15557: Added a test suite for the webbrowser module, thanks to
  Anton Barkovsky.

* bpo-16698: Skip posix test_getgroups when built with OS X
  deployment target prior to 10.6.


Build
-----

* bpo-16067: Add description into MSI file to replace installer's
  temporary name.

* bpo-18257: Fix readlink usage in python-config.  Install the
  python version again on Darwin.

* bpo-18481: Add C coverage reporting with gcov and lcov. A new make
  target "coverage- report" creates an instrumented Python build, runs
  unit tests and creates a HTML. The report can be updated with "make
  coverage-lcov".

* bpo-17845: Clarified the message printed when some module are not
  built.

* bpo-18256: Compilation fix for recent AIX releases.  Patch by
  David Edelsohn.

* bpo-17547: In configure, explicitly pass -Wformat for the benefit
  for GCC 4.8.

* bpo-15172: Document NASM 2.10+ as requirement for building OpenSSL
  1.0.1 on Windows.

* bpo-17591: Use lowercase filenames when including Windows header
  files. Patch by Roumen Petrov.

* bpo-17550: Fix the --enable-profiling configure switch.

* bpo-17425: Build with openssl 1.0.1d on Windows.

* bpo-16754: Fix the incorrect shared library extension on linux.
  Introduce two makefile macros SHLIB_SUFFIX and EXT_SUFFIX. SO now
  has the value of SHLIB_SUFFIX again (as in 2.x and 3.1). The SO
  macro is removed in 3.4.

* bpo-5033: Fix building of the sqlite3 extension module when the
  SQLite library version has "beta" in it. Patch by Andreas Pelme.

* bpo-17228: Fix building without pymalloc.

* bpo-3718: Use AC_ARG_VAR to set MACHDEP in configure.ac.

* bpo-16235: Implement python-config as a shell script.

* bpo-16769: Remove outdated Visual Studio projects.

* bpo-17031: Fix running regen in cross builds.

* bpo-3754: fix typo in pthread AC_CACHE_VAL.

* bpo-15484: Fix _PYTHON_PROJECT_BASE for srcdir != builddir builds;
  use _PYTHON_PROJECT_BASE in distutils/sysconfig.py.

* Drop support for Windows 2000 (changeset e52df05b496a).

* bpo-17029: Let h2py search the multiarch system include directory.

* bpo-16953: Fix socket module compilation on platforms with
  HAVE_BROKEN_POLL. Patch by Jeffrey Armstrong.

* bpo-16320: Remove redundant Makefile dependencies for strings and
  bytes.

* Cross compiling needs host and build settings. configure no longer
  creates a broken PYTHON_FOR_BUILD variable when --build is missing.

* Fix cross compiling issue in setup.py, ensure that lib_dirs and
  inc_dirs are defined in cross compiling mode, too.

* bpo-16836: Enable IPv6 support even if IPv6 is disabled on the
  build host.

* bpo-16593: Have BSD 'make -s' do the right thing, thanks to Daniel
  Shahaf

* bpo-16262: fix out-of-src-tree builds, if mercurial is not
  installed.

* bpo-15298: ensure _sysconfigdata is generated in build directory,
  not source directory.

* bpo-15833: Fix a regression in 3.3 that resulted in exceptions
  being raised if importlib failed to write byte-compiled files.  This
  affected attempts to build Python out-of-tree from a read-only
  source directory.

* bpo-15923: Fix a mistake in "asdl_c.py" that resulted in a
  TypeError after 2801bf875a24 (see #15801).

* bpo-16135: Remove OS/2 support.

* bpo-15819: Make sure we can build Python out-of-tree from a read-
  only source directory. (Somewhat related to bpo-9860.)

* bpo-15587: Enable Tk high-resolution text rendering on Macs with
  Retina displays. Applies to Tkinter apps, such as IDLE, on OS X
  framework builds linked with Cocoa Tk 8.5.

* bpo-17161: make install now also installs a python3 man page.


C API
-----

* bpo-18351: Fix various issues in a function in importlib provided
  to help PyImport_ExecCodeModuleWithPathnames() (and thus by
  extension PyImport_ExecCodeModule() and
  PyImport_ExecCodeModuleEx()).

* bpo-9369: The types of "char*" arguments of
  PyObject_CallFunction() and PyObject_CallMethod() now changed to
  "const char*".  Based on patches by Jörg Müller and Lars Buitinck.

* bpo-17206: Py_CLEAR(), Py_DECREF(), Py_XINCREF() and Py_XDECREF()
  now expand their arguments once instead of multiple times.  Patch
  written by Illia Polosukhin.

* bpo-17522: Add the PyGILState_Check() API.

* bpo-17327: Add PyDict_SetDefault.

* bpo-16881: Fix Py_ARRAY_LENGTH macro for GCC < 3.1.

* bpo-16505: Remove unused Py_TPFLAGS_INT_SUBCLASS.

* bpo-16086: PyTypeObject.tp_flags and PyType_Spec.flags are now
  unsigned (unsigned long and unsigned int) to avoid an undefined
  behaviour with Py_TPFLAGS_TYPE_SUBCLASS ((1 << 31).
  PyType_GetFlags() result type is now unsigned too (unsigned long,
  instead of long).

* bpo-16166: Add PY_LITTLE_ENDIAN and PY_BIG_ENDIAN macros and
  unified endianness detection and handling.


Documentation
-------------

* bpo-23006: Improve the documentation and indexing of
  dict.__missing__. Add an entry in the language datamodel special
  methods section. Revise and index its discussion in the stdtypes
  mapping/dict section.

* bpo-17701: Improving strftime documentation.

* bpo-18440: Clarify that "hash()" can truncate the value returned
  from an object's custom "__hash__()" method.

* bpo-17844: Add links to encoders and decoders for bytes-to-bytes
  codecs.

* bpo-14097: improve the "introduction" page of the tutorial.

* bpo-17977: The documentation for the cadefault argument's default
  value in urllib.request.urlopen() is fixed to match the code.

* bpo-6696: add documentation for the Profile objects, and improve
  profile/cProfile docs.  Patch by Tom Pinckney.

* bpo-15940: Specify effect of locale on time functions.

* bpo-17538: Document XML vulnerabilties

* bpo-16642: sched.scheduler timefunc initial default is
  time.monotonic. Patch by Ramchandra Apte

* bpo-17047: remove doubled words in docs and docstrings reported by
  Serhiy Storchaka and Matthew Barnett.

* bpo-15465: Document the versioning macros in the C API docs rather
  than the standard library docs. Patch by Kushal Das.

* bpo-16406: Combine the pages for uploading and registering to
  PyPI.

* bpo-16403: Document how distutils uses the maintainer field in
  PKG- INFO. Patch by Jyrki Pulliainen.

* bpo-16695: Document how glob handles filenames starting with a
  dot. Initial patch by Jyrki Pulliainen.

* bpo-8890: Stop advertising an insecure practice by replacing uses
  of the /tmp directory with better alternatives in the documentation.
  Patch by Geoff Wilson.

* bpo-17203: add long option names to unittest discovery docs.

* bpo-13094: add "Why do lambdas defined in a loop with different
  values all return the same result?" programming FAQ.

* bpo-14901: Update portions of the Windows FAQ. Patch by Ashish
  Nitin Patil.

* bpo-16267: Better document the 3.3+ approach to combining
  @abstractmethod with @staticmethod, @classmethod and @property

* bpo-15209: Clarify exception chaining description in exceptions
  module documentation

* bpo-15990: Improve argument/parameter documentation.

* bpo-16209: Move the documentation for the str built-in function to
  a new str class entry in the "Text Sequence Type" section.

* bpo-13538: Improve str() and object.__str__() documentation.

* bpo-16489: Make it clearer that importlib.find_loader() needs
  parent packages to be explicitly imported.

* bpo-16400: Update the description of which versions of a given
  package PyPI displays.

* bpo-15677: Document that zlib and gzip accept a compression level
  of 0 to mean 'no compression'. Patch by Brian Brazil.

* bpo-16197: Update winreg docstrings and documentation to match
  code. Patch by Zachary Ware.

* bpo-8040: added a version switcher to the documentation.  Patch by
  Yury Selivanov.

* bpo-16241: Document -X faulthandler command line option. Patch by
  Marek Šuppa.

* Additional comments and some style changes in the
  concurrent.futures URL retrieval example

* bpo-16115: Improve subprocess.Popen() documentation around args,
  shell, and executable arguments.

* bpo-13498: Clarify docs of os.makedirs()'s exist_ok argument.
  Done with great native- speaker help from R. David Murray.

* bpo-15533: Clarify docs and add tests for "subprocess.Popen()"'s
  cwd argument.

* bpo-15979: Improve timeit documentation.

* bpo-16036: Improve documentation of built-in "int()"'s signature
  and arguments.

* bpo-15935: Clarification of "argparse" docs, re: add_argument()
  type and default arguments.  Patch contributed by Chris Jerdonek.

* bpo-11964: Document a change in v3.2 to the behavior of the indent
  parameter of json encoding operations.

* bpo-15116: Remove references to appscript as it is no longer being
  supported.


Tools/Demos
-----------

* bpo-18817: Fix a resource warning in Lib/aifc.py demo.  Patch by
  Vajrasky Kok.

* bpo-18439: Make patchcheck work on Windows for ACKS, NEWS.

* bpo-18448: Fix a typo in Tools/demo/eiffel.py.

* bpo-18457: Fixed saving of formulas and complex numbers in
  Tools/demo/ss1.py.

* bpo-18449: Make Tools/demo/ss1.py work again on Python 3.  Patch
  by Févry Thibault.

* bpo-12990: The "Python Launcher" on OSX could not launch python
  scripts that have paths that include wide characters.

* bpo-15239: Make mkstringprep.py work again on Python 3.

* bpo-17028: Allowed Python arguments to be supplied to the Windows
  launcher.

* bpo-17156: pygettext.py now detects the encoding of source files
  and correctly writes and escapes non-ascii characters.

* bpo-15539: Fix a number of bugs in Tools/scripts/pindent.py.  Now
  pindent.py works with a "with" statement.  pindent.py no longer
  produces improper indentation. pindent.py now works with continued
  lines broken after "class" or "def" keywords and with continuations
  at the start of line.

* bpo-11797: Add a 2to3 fixer that maps reload() to imp.reload().

* bpo-10966: Remove the concept of unexpected skipped tests.

* bpo-9893: Removed the Misc/Vim directory.

* Removed the Misc/TextMate directory.

* bpo-16245: Add the Tools/scripts/parse_html5_entities.py script to
  parse the list of HTML5 entities and update the html.entities.html5
  dictionary.

* bpo-15378: Fix Tools/unicode/comparecodecs.py.  Patch by Serhiy
  Storchaka.

* bpo-16549: Make json.tool work again on Python 3 and add tests.
  Initial patch by Berker Peksag and Serhiy Storchaka.

* bpo-13301: use ast.literal_eval() instead of eval() in
  Tools/i18n/msgfmt.py. Patch by Serhiy Storchaka.


Windows
-------

* bpo-18569: The installer now adds .py to the PATHEXT variable when
  extensions are registered. Patch by Paul Moore.

**(For information about older versions, consult the HISTORY file.)**
