
``future_builtins`` --- Python 3 builtins
*****************************************

New in version 2.6.

This module provides functions that exist in 2.x, but have different
behavior in Python 3, so they cannot be put into the 2.x builtin
namespace.

Instead, if you want to write code compatible with Python 3 builtins,
import them from this module, like this:

   from future_builtins import map, filter

   ... code using Python 3-style map and filter ...

The *2to3* tool that ports Python 2 code to Python 3 will recognize
this usage and leave the new builtins alone.

Note: The Python 3 ``print()`` function is already in the builtins, but
  cannot be accessed from Python 2 code unless you use the appropriate
  future statement:

     from __future__ import print_function

Available builtins are:

future_builtins.ascii(object)

   Returns the same as ``repr()``.  In Python 3, ``repr()`` will
   return printable Unicode characters unescaped, while ``ascii()``
   will always backslash-escape them.  Using
   ``future_builtins.ascii()`` instead of ``repr()`` in 2.6 code makes
   it clear that you need a pure ASCII return value.

future_builtins.filter(function, iterable)

   Works like ``itertools.ifilter()``.

future_builtins.hex(object)

   Works like the builtin ``hex()``, but instead of ``__hex__()`` it
   will use the ``__index__()`` method on its argument to get an
   integer that is then converted to hexadecimal.

future_builtins.map(function, iterable, ...)

   Works like ``itertools.imap()``.

future_builtins.oct(object)

   Works like the builtin ``oct()``, but instead of ``__oct__()`` it
   will use the ``__index__()`` method on its argument to get an
   integer that is then converted to hexadecimal.

future_builtins.zip(*iterables)

   Works like ``itertools.izip()``.
