:mod:`future_builtins` --- Python 3 builtins

============================================

.. module:: future_builtins

.. sectionauthor:: Georg Brandl

.. versionadded:: 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 :term:`2to3` tool that ports Python 2 code to Python 3 will recognize

this usage and leave the new builtins alone.

.. note::

   The Python 3 :func:`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:

.. function:: ascii(object)

   Returns the same as :func:`repr`.  In Python 3, :func:`repr` will return

   printable Unicode characters unescaped, while :func:`ascii` will always

   backslash-escape them.  Using :func:`future_builtins.ascii` instead of

   :func:`repr` in 2.6 code makes it clear that you need a pure ASCII return

   value.

.. function:: filter(function, iterable)

   Works like :func:`itertools.ifilter`.

.. function:: hex(object)

   Works like the builtin :func:`hex`, but instead of :meth:`__hex__` it will

   use the :meth:`__index__` method on its argument to get an integer that is

   then converted to hexadecimal.

.. function:: map(function, iterable, ...)

   Works like :func:`itertools.imap`.

.. function:: oct(object)

   Works like the builtin :func:`oct`, but instead of :meth:`__oct__` it will

   use the :meth:`__index__` method on its argument to get an integer that is

   then converted to hexadecimal.

.. function:: zip(*iterables)

   Works like :func:`itertools.izip`.