# Python Module Index

_ | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | z

| _ |
| `__future__` | Future statement definitions
| `__main__` | The environment where top-level code is run. Covers command-line interfaces, import-time behavior, and ``__name__ == '__main__'``.
| `_thread` | Low-level threading API.
| `_tkinter` | A binary module that contains the low-level interface to Tcl/Tk.
| a |
| `abc` | Abstract base classes according to :pep:`3119`.
| `aifc` | Deprecated: Read and write audio files in AIFF or AIFC format.
| `argparse` | Command-line option and argument parsing library.
| `array` | Space efficient arrays of uniformly typed numeric values.
| `ast` | Abstract Syntax Tree classes and manipulation.
| `asynchat` | Deprecated: Removed in 3.12.
| `asyncio` | Asynchronous I/O.
| `asyncore` | Deprecated: Removed in 3.12.
| `atexit` | Register and execute cleanup functions.
| `audioop` | Deprecated: Manipulate raw audio data.
| b |
| `base64` | RFC 4648: Base16, Base32, Base64 Data Encodings; Base85 and Ascii85
| `bdb` | Debugger framework.
| `binascii` | Tools for converting between binary and various ASCII-encoded binary representations.
| `bisect` | Array bisection algorithms for binary searching.
| `builtins` | The module that provides the built-in namespace.
| `bz2` | Interfaces for bzip2 compression and decompression.
| c |
| `calendar` | Functions for working with calendars, including some emulation of the Unix cal program.
| `cgi` | Deprecated: Helpers for running Python scripts via the Common Gateway Interface.
| `cgitb` | Deprecated: Configurable traceback handler for CGI scripts.
| `chunk` | Deprecated: Module to read IFF chunks.
| `cmath` | Mathematical functions for complex numbers.
| `cmd` | Build line-oriented command interpreters.
| `code` | Facilities to implement read-eval-print loops.
| `codecs` | Encode and decode data and streams.
| `codeop` | Compile (possibly incomplete) Python code.
| `collections` | Container datatypes
| `collections.abc` | Abstract base classes for containers
| `colorsys` | Conversion functions between RGB and other color systems.
| `compileall` | Tools for byte-compiling all Python source files in a directory tree.
| `concurrent` |
| `concurrent.futures` | Execute computations concurrently using threads or processes.
| `configparser` | Configuration file parser.
| `contextlib` | Utilities for with-statement contexts.
| `contextvars` | Context Variables
| `copy` | Shallow and deep copy operations.
| `copyreg` | Register pickle support functions.
| `cProfile` |
| `crypt` (Unix) | Deprecated: The crypt() function used to check Unix passwords.
| `csv` | Write and read tabular data to and from delimited files.
| `ctypes` | A foreign function library for Python.
| `curses` (Unix) | An interface to the curses library, providing portable terminal handling.
| `curses.ascii` | Constants and set-membership functions for ASCII characters.
| `curses.panel` | A panel stack extension that adds depth to curses windows.
| `curses.textpad` | Emacs-like input editing in a curses window.
| d |
| `dataclasses` | Generate special methods on user-defined classes.
| `datetime` | Basic date and time types.
| `dbm` | Interfaces to various Unix "database" formats.
| `dbm.dumb` | Portable implementation of the simple DBM interface.
| `dbm.gnu` (Unix) | GNU database manager
| `dbm.ndbm` (Unix) | The New Database Manager
| `decimal` | Implementation of the General Decimal Arithmetic Specification.
| `difflib` | Helpers for computing differences between objects.
| `dis` | Disassembler for Python bytecode.
| `distutils` | Deprecated: Removed in 3.12.
| `doctest` | Test pieces of code within docstrings.
| e |
| `email` | Package supporting the parsing, manipulating, and generating email messages.
| `email.charset` | Character Sets
| `email.contentmanager` | Storing and Retrieving Content from MIME Parts
| `email.encoders` | Encoders for email message payloads.
| `email.errors` | The exception classes used by the email package.
| `email.generator` | Generate flat text email messages from a message structure.
| `email.header` | Representing non-ASCII headers
| `email.headerregistry` | Automatic Parsing of headers based on the field name
| `email.iterators` | Iterate over a message object tree.
| `email.message` | The base class representing email messages.
| `email.mime` | Build MIME messages.
| `email.mime.application` |
| `email.mime.audio` |
| `email.mime.base` |
| `email.mime.image` |
| `email.mime.message` |
| `email.mime.multipart` |
| `email.mime.nonmultipart` |
| `email.mime.text` |
| `email.parser` | Parse flat text email messages to produce a message object structure.
| `email.policy` | Controlling the parsing and generating of messages
| `email.utils` | Miscellaneous email package utilities.
| `encodings` |
| `encodings.idna` | Internationalized Domain Names implementation
| `encodings.mbcs` | Windows ANSI codepage
| `encodings.utf_8_sig` | UTF-8 codec with BOM signature
| `ensurepip` | Bootstrapping the "pip" installer into an existing Python installation or virtual environment.
| `enum` | Implementation of an enumeration class.
| `errno` | Standard errno system symbols.
| f |
| `faulthandler` | Dump the Python traceback.
| `fcntl` (Unix) | The fcntl() and ioctl() system calls.
| `filecmp` | Compare files efficiently.
| `fileinput` | Loop over standard input or a list of files.
| `fnmatch` | Unix shell style filename pattern matching.
| `fractions` | Rational numbers.
| `ftplib` | FTP protocol client (requires sockets).
| `functools` | Higher-order functions and operations on callable objects.
| g |
| `gc` | Interface to the cycle-detecting garbage collector.
| `getopt` | Portable parser for command line options; support both short and long option names.
| `getpass` | Portable reading of passwords and retrieval of the userid.
| `gettext` | Multilingual internationalization services.
| `glob` | Unix shell style pathname pattern expansion.
| `graphlib` | Functionality to operate with graph-like structures
| `grp` (Unix) | The group database (getgrnam() and friends).
| `gzip` | Interfaces for gzip compression and decompression using file objects.
| h |
| `hashlib` | Secure hash and message digest algorithms.
| `heapq` | Heap queue algorithm (a.k.a. priority queue).
| `hmac` | Keyed-Hashing for Message Authentication (HMAC) implementation
| `html` | Helpers for manipulating HTML.
| `html.entities` | Definitions of HTML general entities.
| `html.parser` | A simple parser that can handle HTML and XHTML.
| `http` | HTTP status codes and messages
| `http.client` | HTTP and HTTPS protocol client (requires sockets).
| `http.cookiejar` | Classes for automatic handling of HTTP cookies.
| `http.cookies` | Support for HTTP state management (cookies).
| `http.server` | HTTP server and request handlers.
| i |
| `idlelib` | Implementation package for the IDLE shell/editor.
| `imaplib` | IMAP4 protocol client (requires sockets).
| `imghdr` | Deprecated: Determine the type of image contained in a file or byte stream.
| `imp` | Deprecated: Removed in 3.12.
| `importlib` | The implementation of the import machinery.
| `importlib.abc` | Abstract base classes related to import
| `importlib.machinery` | Importers and path hooks
| `importlib.metadata` | Accessing package metadata
| `importlib.resources` | Package resource reading, opening, and access
| `importlib.resources.abc` | Abstract base classes for resources
| `importlib.util` | Utility code for importers
| `inspect` | Extract information and source code from live objects.
| `io` | Core tools for working with streams.
| `ipaddress` | IPv4/IPv6 manipulation library.
| `itertools` | Functions creating iterators for efficient looping.
| j |
| `json` | Encode and decode the JSON format.
| `json.tool` | A command line to validate and pretty-print JSON.
| k |
| `keyword` | Test whether a string is a keyword in Python.
| l |
| `lib2to3` | The 2to3 library
| `linecache` | Provides random access to individual lines from text files.
| `locale` | Internationalization services.
| `logging` | Flexible event logging system for applications.
| `logging.config` | Configuration of the logging module.
| `logging.handlers` | Handlers for the logging module.
| `lzma` | A Python wrapper for the liblzma compression library.
| m |
| `mailbox` | Manipulate mailboxes in various formats
| `mailcap` | Deprecated: Mailcap file handling.
| `marshal` | Convert Python objects to streams of bytes and back (with different constraints).
| `math` | Mathematical functions (sin() etc.).
| `mimetypes` | Mapping of filename extensions to MIME types.
| `mmap` | Interface to memory-mapped files for Unix and Windows.
| `modulefinder` | Find modules used by a script.
| `msilib` (Windows) | Deprecated: Creation of Microsoft Installer files, and CAB files.
| `msvcrt` (Windows) | Miscellaneous useful routines from the MS VC++ runtime.
| `multiprocessing` | Process-based parallelism.
| `multiprocessing.connection` | API for dealing with sockets.
| `multiprocessing.dummy` | Dumb wrapper around threading.
| `multiprocessing.managers` | Share data between process with shared objects.
| `multiprocessing.pool` | Create pools of processes.
| `multiprocessing.shared_memory` | Provides shared memory for direct access across processes.
| `multiprocessing.sharedctypes` | Allocate ctypes objects from shared memory.
| n |
| `netrc` | Loading of .netrc files.
| `nis` (Unix) | Deprecated: Interface to Sun's NIS (Yellow Pages) library.
| `nntplib` | Deprecated: NNTP protocol client (requires sockets).
| `numbers` | Numeric abstract base classes (Complex, Real, Integral, etc.).
| o |
| `operator` | Functions corresponding to the standard operators.
| `optparse` | Deprecated: Command-line option parsing library.
| `os` | Miscellaneous operating system interfaces.
| `os.path` | Operations on pathnames.
| `ossaudiodev` (Linux, FreeBSD) | Deprecated: Access to OSS-compatible audio devices.
| p |
| `pathlib` | Object-oriented filesystem paths
| `pdb` | The Python debugger for interactive interpreters.
| `pickle` | Convert Python objects to streams of bytes and back.
| `pickletools` | Contains extensive comments about the pickle protocols and pickle-machine opcodes, as well as some useful functions.
| `pipes` (Unix) | Deprecated: A Python interface to Unix shell pipelines.
| `pkgutil` | Utilities for the import system.
| `platform` | Retrieves as much platform identifying data as possible.
| `plistlib` | Generate and parse Apple plist files.
| `poplib` | POP3 protocol client (requires sockets).
| `posix` (Unix) | The most common POSIX system calls (normally used via module os).
| `pprint` | Data pretty printer.
| `profile` | Python source profiler.
| `pstats` | Statistics object for use with the profiler.
| `pty` (Unix) | Pseudo-Terminal Handling for Unix.
| `pwd` (Unix) | The password database (getpwnam() and friends).
| `py_compile` | Generate byte-code files from Python source files.
| `pyclbr` | Supports information extraction for a Python module browser.
| `pydoc` | Documentation generator and online help system.
| q |
| `queue` | A synchronized queue class.
| `quopri` | Encode and decode files using the MIME quoted-printable encoding.
| r |
| `random` | Generate pseudo-random numbers with various common distributions.
| `re` | Regular expression operations.
| `readline` (Unix) | GNU readline support for Python.
| `reprlib` | Alternate repr() implementation with size limits.
| `resource` (Unix) | An interface to provide resource usage information on the current process.
| `rlcompleter` | Python identifier completion, suitable for the GNU readline library.
| `runpy` | Locate and run Python modules without importing them first.
| s |
| `sched` | General purpose event scheduler.
| `secrets` | Generate secure random numbers for managing secrets.
| `select` | Wait for I/O completion on multiple streams.
| `selectors` | High-level I/O multiplexing.
| `shelve` | Python object persistence.
| `shlex` | Simple lexical analysis for Unix shell-like languages.
| `shutil` | High-level file operations, including copying.
| `signal` | Set handlers for asynchronous events.
| `site` | Module responsible for site-specific configuration.
| `sitecustomize` |
| `smtpd` | Deprecated: Removed in 3.12.
| `smtplib` | SMTP protocol client (requires sockets).
| `sndhdr` | Deprecated: Determine type of a sound file.
| `socket` | Low-level networking interface.
| `socketserver` | A framework for network servers.
| `spwd` (Unix) | Deprecated: The shadow password database (getspnam() and friends).
| `sqlite3` | A DB-API 2.0 implementation using SQLite 3.x.
| `ssl` | TLS/SSL wrapper for socket objects
| `stat` | Utilities for interpreting the results of os.stat(), os.lstat() and os.fstat().
| `statistics` | Mathematical statistics functions
| `string` | Common string operations.
| `stringprep` | String preparation, as per RFC 3453
| `struct` | Interpret bytes as packed binary data.
| `subprocess` | Subprocess management.
| `sunau` | Deprecated: Provide an interface to the Sun AU sound format.
| `symtable` | Interface to the compiler's internal symbol tables.
| `sys` | Access system-specific parameters and functions.
| `sys.monitoring` | Access and control event monitoring
| `sysconfig` | Python's configuration information
| `syslog` (Unix) | An interface to the Unix syslog library routines.
| t |
| `tabnanny` | Tool for detecting white space related problems in Python source files in a directory tree.
| `tarfile` | Read and write tar-format archive files.
| `telnetlib` | Deprecated: Telnet client class.
| `tempfile` | Generate temporary files and directories.
| `termios` (Unix) | POSIX style tty control.
| `test` | Regression tests package containing the testing suite for Python.
| `test.regrtest` | Drives the regression test suite.
| `test.support` | Support for Python's regression test suite.
| `test.support.bytecode_helper` | Support tools for testing correct bytecode generation.
| `test.support.import_helper` | Support for import tests.
| `test.support.os_helper` | Support for os tests.
| `test.support.script_helper` | Support for Python's script execution tests.
| `test.support.socket_helper` | Support for socket tests.
| `test.support.threading_helper` | Support for threading tests.
| `test.support.warnings_helper` | Support for warnings tests.
| `textwrap` | Text wrapping and filling
| `threading` | Thread-based parallelism.
| `time` | Time access and conversions.
| `timeit` | Measure the execution time of small code snippets.
| `tkinter` | Interface to Tcl/Tk for graphical user interfaces
| `tkinter.colorchooser` (Tk) | Color choosing dialog
| `tkinter.commondialog` (Tk) | Tkinter base class for dialogs
| `tkinter.dnd` (Tk) | Tkinter drag-and-drop interface
| `tkinter.filedialog` (Tk) | Dialog classes for file selection
| `tkinter.font` (Tk) | Tkinter font-wrapping class
| `tkinter.messagebox` (Tk) | Various types of alert dialogs
| `tkinter.scrolledtext` (Tk) | Text widget with a vertical scroll bar.
| `tkinter.simpledialog` (Tk) | Simple dialog windows
| `tkinter.tix` | Tk Extension Widgets for Tkinter
| `tkinter.ttk` | Tk themed widget set
| `token` | Constants representing terminal nodes of the parse tree.
| `tokenize` | Lexical scanner for Python source code.
| `tomllib` | Parse TOML files.
| `trace` | Trace or track Python statement execution.
| `traceback` | Print or retrieve a stack traceback.
| `tracemalloc` | Trace memory allocations.
| `tty` (Unix) | Utility functions that perform common terminal control operations.
| `turtle` | An educational framework for simple graphics applications
| `turtledemo` | A viewer for example turtle scripts
| `types` | Names for built-in types.
| `typing` | Support for type hints (see :pep:`484`).
| u |
| `unicodedata` | Access the Unicode Database.
| `unittest` | Unit testing framework for Python.
| `unittest.mock` | Mock object library.
| `urllib` |
| `urllib.error` | Exception classes raised by urllib.request.
| `urllib.parse` | Parse URLs into or assemble them from components.
| `urllib.request` | Extensible library for opening URLs.
| `urllib.response` | Response classes used by urllib.
| `urllib.robotparser` | Load a robots.txt file and answer questions about fetchability of other URLs.
| `usercustomize` |
| `uu` | Deprecated: Encode and decode files in uuencode format.
| `uuid` | UUID objects (universally unique identifiers) according to RFC 4122
| v |
| `venv` | Creation of virtual environments.
| w |
| `warnings` | Issue warning messages and control their disposition.
| `wave` | Provide an interface to the WAV sound format.
| `weakref` | Support for weak references and weak dictionaries.
| `webbrowser` | Easy-to-use controller for web browsers.
| `winreg` (Windows) | Routines and objects for manipulating the Windows registry.
| `winsound` (Windows) | Access to the sound-playing machinery for Windows.
| `wsgiref` | WSGI Utilities and Reference Implementation.
| `wsgiref.handlers` | WSGI server/gateway base classes.
| `wsgiref.headers` | WSGI response header tools.
| `wsgiref.simple_server` | A simple WSGI HTTP server.
| `wsgiref.types` | WSGI types for static type checking
| `wsgiref.util` | WSGI environment utilities.
| `wsgiref.validate` | WSGI conformance checker.
| x |
| `xdrlib` | Deprecated: Encoders and decoders for the External Data Representation (XDR).
| `xml` | Package containing XML processing modules
| `xml.dom` | Document Object Model API for Python.
| `xml.dom.minidom` | Minimal Document Object Model (DOM) implementation.
| `xml.dom.pulldom` | Support for building partial DOM trees from SAX events.
| `xml.etree.ElementInclude` |
| `xml.etree.ElementTree` | Implementation of the ElementTree API.
| `xml.parsers.expat` | An interface to the Expat non-validating XML parser.
| `xml.parsers.expat.errors` |
| `xml.parsers.expat.model` |
| `xml.sax` | Package containing SAX2 base classes and convenience functions.
| `xml.sax.handler` | Base classes for SAX event handlers.
| `xml.sax.saxutils` | Convenience functions and classes for use with SAX.
| `xml.sax.xmlreader` | Interface which SAX-compliant XML parsers must implement.
| `xmlrpc` | Server and client modules implementing XML-RPC.
| `xmlrpc.client` | XML-RPC client access.
| `xmlrpc.server` | Basic XML-RPC server implementations.
| z |
| `zipapp` | Manage executable Python zip archives
| `zipfile` | Read and write ZIP-format archive files.
| `zipimport` | Support for importing Python modules from ZIP archives.
| `zlib` | Low-level interface to compression and decompression routines compatible with gzip.
| `zoneinfo` | IANA time zone support