author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`future_builtins` --- Python 3 builtins |
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============================================ |
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.. module:: future_builtins |
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.. sectionauthor:: Georg Brandl |
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.. versionadded:: 2.6 |
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This module provides functions that exist in 2.x, but have different behavior in |
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Python 3, so they cannot be put into the 2.x builtin namespace. |
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Instead, if you want to write code compatible with Python 3 builtins, import |
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them from this module, like this:: |
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from future_builtins import map, filter |
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... code using Python 3-style map and filter ... |
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The :term:`2to3` tool that ports Python 2 code to Python 3 will recognize |
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this usage and leave the new builtins alone. |
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.. note:: |
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The Python 3 :func:`print` function is already in the builtins, but cannot be |
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accessed from Python 2 code unless you use the appropriate future statement:: |
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from __future__ import print_function |
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Available builtins are: |
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.. function:: ascii(object) |
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Returns the same as :func:`repr`. In Python 3, :func:`repr` will return |
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printable Unicode characters unescaped, while :func:`ascii` will always |
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backslash-escape them. Using :func:`future_builtins.ascii` instead of |
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:func:`repr` in 2.6 code makes it clear that you need a pure ASCII return |
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value. |
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.. function:: filter(function, iterable) |
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Works like :func:`itertools.ifilter`. |
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.. function:: hex(object) |
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Works like the builtin :func:`hex`, but instead of :meth:`__hex__` it will |
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use the :meth:`__index__` method on its argument to get an integer that is |
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then converted to hexadecimal. |
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.. function:: map(function, iterable, ...) |
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Works like :func:`itertools.imap`. |
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.. function:: oct(object) |
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Works like the builtin :func:`oct`, but instead of :meth:`__oct__` it will |
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use the :meth:`__index__` method on its argument to get an integer that is |
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then converted to hexadecimal. |
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.. function:: zip(*iterables) |
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Works like :func:`itertools.izip`. |