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docs/pasteurize.rst
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Jon Dufresne
Update pypi.python.org URLs to pypi.org
12 сен 2018, 04:53
12 сен 2018, 04:53
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.. _backwards-conversion: ``pasteurize``: Py3 to Py2/3 ---------------------------- Running ``pasteurize -w mypy3module.py`` turns this Python 3 code:: import configparser import copyreg class Blah: pass print('Hello', end=None) into this code which runs on both Py2 and Py3:: from __future__ import print_function from future import standard_library standard_library.install_hooks() import configparser import copyreg class Blah(object): pass print('Hello', end=None) Notice that both ``futurize`` and ``pasteurize`` create explicit new-style classes that inherit from ``object`` on both Python versions, and both refer to stdlib modules (as well as builtins) under their Py3 names. Note also that the ``configparser`` module is a special case; there is a full backport available on PyPI (https://pypi.org/project/configparser/), so, as of v0.16.0, ``python-future`` no longer provides a ``configparser`` package alias. To use the resulting code on Py2, install the ``configparser`` backport with ``pip install configparser`` or by adding it to your ``requirements.txt`` file. ``pasteurize`` also handles the following Python 3 features: - keyword-only arguments - metaclasses (using :func:`~future.utils.with_metaclass`) - extended tuple unpacking (PEP 3132) To handle function annotations (PEP 3107), see :ref:`func_annotations`.