packaging


Namepackaging JSON
Version 21.0 PyPI version JSON
download
home_pagehttps://github.com/pypa/packaging
SummaryCore utilities for Python packages
upload_time2021-07-03 12:32:32
maintainer
docs_urlNone
authorDonald Stufft and individual contributors
requires_python>=3.6
licenseBSD-2-Clause or Apache-2.0
keywords
VCS
bugtrack_url
requirements No requirements were recorded.
Travis-CI No Travis.
coveralls test coverage
            packaging
=========

.. start-intro

Reusable core utilities for various Python Packaging
`interoperability specifications <https://packaging.python.org/specifications/>`_.

This library provides utilities that implement the interoperability
specifications which have clearly one correct behaviour (eg: :pep:`440`)
or benefit greatly from having a single shared implementation (eg: :pep:`425`).

.. end-intro

The ``packaging`` project includes the following: version handling, specifiers,
markers, requirements, tags, utilities.

Documentation
-------------

The `documentation`_ provides information and the API for the following:

- Version Handling
- Specifiers
- Markers
- Requirements
- Tags
- Utilities

Installation
------------

Use ``pip`` to install these utilities::

    pip install packaging

Discussion
----------

If you run into bugs, you can file them in our `issue tracker`_.

You can also join ``#pypa`` on Freenode to ask questions or get involved.


.. _`documentation`: https://packaging.pypa.io/
.. _`issue tracker`: https://github.com/pypa/packaging/issues


Code of Conduct
---------------

Everyone interacting in the packaging project's codebases, issue trackers, chat
rooms, and mailing lists is expected to follow the `PSF Code of Conduct`_.

.. _PSF Code of Conduct: https://github.com/pypa/.github/blob/main/CODE_OF_CONDUCT.md

Contributing
------------

The ``CONTRIBUTING.rst`` file outlines how to contribute to this project as
well as how to report a potential security issue. The documentation for this
project also covers information about `project development`_ and `security`_.

.. _`project development`: https://packaging.pypa.io/en/latest/development/
.. _`security`: https://packaging.pypa.io/en/latest/security/

Project History
---------------

Please review the ``CHANGELOG.rst`` file or the `Changelog documentation`_ for
recent changes and project history.

.. _`Changelog documentation`: https://packaging.pypa.io/en/latest/changelog/

Changelog
---------

21.0 - 2021-07-03
~~~~~~~~~~~~~~~~~

* `packaging` is now only compatible with Python 3.6 and above.
* Add support for zip files in ``parse_sdist_filename`` (`#429 <https://github.com/pypa/packaging/issues/429>`__)

20.9 - 2021-01-29
~~~~~~~~~~~~~~~~~

* Run `isort <https://pypi.org/project/isort/>`_ over the code base (`#377 <https://github.com/pypa/packaging/issues/377>`__)
* Add support for the ``macosx_10_*_universal2`` platform tags (`#379 <https://github.com/pypa/packaging/issues/379>`__)
* Introduce ``packaging.utils.parse_wheel_filename()`` and ``parse_sdist_filename()``
  (`#387 <https://github.com/pypa/packaging/issues/387>`__ and `#389 <https://github.com/pypa/packaging/issues/389>`__)

20.8 - 2020-12-11
~~~~~~~~~~~~~~~~~

* Revert back to setuptools for compatibility purposes for some Linux distros (`#363 <https://github.com/pypa/packaging/issues/363>`__)
* Do not insert an underscore in wheel tags when the interpreter version number
  is more than 2 digits (`#372 <https://github.com/pypa/packaging/issues/372>`__)

20.7 - 2020-11-28
~~~~~~~~~~~~~~~~~

No unreleased changes.

20.6 - 2020-11-28
~~~~~~~~~~~~~~~~~

.. note:: This release was subsequently yanked, and these changes were included in 20.7.

* Fix flit configuration, to include LICENSE files (`#357 <https://github.com/pypa/packaging/issues/357>`__)
* Make `intel` a recognized CPU architecture for the `universal` macOS platform tag (`#361 <https://github.com/pypa/packaging/issues/361>`__)
* Add some missing type hints to `packaging.requirements` (issue:`350`)

20.5 - 2020-11-27
~~~~~~~~~~~~~~~~~

* Officially support Python 3.9 (`#343 <https://github.com/pypa/packaging/issues/343>`__)
* Deprecate the ``LegacyVersion`` and ``LegacySpecifier`` classes (`#321 <https://github.com/pypa/packaging/issues/321>`__)
* Handle ``OSError`` on non-dynamic executables when attempting to resolve
  the glibc version string.

20.4 - 2020-05-19
~~~~~~~~~~~~~~~~~

* Canonicalize version before comparing specifiers. (`#282 <https://github.com/pypa/packaging/issues/282>`__)
* Change type hint for ``canonicalize_name`` to return
  ``packaging.utils.NormalizedName``.
  This enables the use of static typing tools (like mypy) to detect mixing of
  normalized and un-normalized names.

20.3 - 2020-03-05
~~~~~~~~~~~~~~~~~

* Fix changelog for 20.2.

20.2 - 2020-03-05
~~~~~~~~~~~~~~~~~

* Fix a bug that caused a 32-bit OS that runs on a 64-bit ARM CPU (e.g. ARM-v8,
  aarch64), to report the wrong bitness.

20.1 - 2020-01-24
~~~~~~~~~~~~~~~~~~~

* Fix a bug caused by reuse of an exhausted iterator. (`#257 <https://github.com/pypa/packaging/issues/257>`__)

20.0 - 2020-01-06
~~~~~~~~~~~~~~~~~

* Add type hints (`#191 <https://github.com/pypa/packaging/issues/191>`__)

* Add proper trove classifiers for PyPy support (`#198 <https://github.com/pypa/packaging/issues/198>`__)

* Scale back depending on ``ctypes`` for manylinux support detection (`#171 <https://github.com/pypa/packaging/issues/171>`__)

* Use ``sys.implementation.name`` where appropriate for ``packaging.tags`` (`#193 <https://github.com/pypa/packaging/issues/193>`__)

* Expand upon the API provided by ``packaging.tags``: ``interpreter_name()``, ``mac_platforms()``, ``compatible_tags()``, ``cpython_tags()``, ``generic_tags()`` (`#187 <https://github.com/pypa/packaging/issues/187>`__)

* Officially support Python 3.8 (`#232 <https://github.com/pypa/packaging/issues/232>`__)

* Add ``major``, ``minor``, and ``micro`` aliases to ``packaging.version.Version`` (`#226 <https://github.com/pypa/packaging/issues/226>`__)

* Properly mark ``packaging`` has being fully typed by adding a `py.typed` file (`#226 <https://github.com/pypa/packaging/issues/226>`__)

19.2 - 2019-09-18
~~~~~~~~~~~~~~~~~

* Remove dependency on ``attrs`` (`#178 <https://github.com/pypa/packaging/issues/178>`__, `#179 <https://github.com/pypa/packaging/issues/179>`__)

* Use appropriate fallbacks for CPython ABI tag (`#181 <https://github.com/pypa/packaging/issues/181>`__, `#185 <https://github.com/pypa/packaging/issues/185>`__)

* Add manylinux2014 support (`#186 <https://github.com/pypa/packaging/issues/186>`__)

* Improve ABI detection (`#181 <https://github.com/pypa/packaging/issues/181>`__)

* Properly handle debug wheels for Python 3.8 (`#172 <https://github.com/pypa/packaging/issues/172>`__)

* Improve detection of debug builds on Windows (`#194 <https://github.com/pypa/packaging/issues/194>`__)

19.1 - 2019-07-30
~~~~~~~~~~~~~~~~~

* Add the ``packaging.tags`` module. (`#156 <https://github.com/pypa/packaging/issues/156>`__)

* Correctly handle two-digit versions in ``python_version`` (`#119 <https://github.com/pypa/packaging/issues/119>`__)


19.0 - 2019-01-20
~~~~~~~~~~~~~~~~~

* Fix string representation of PEP 508 direct URL requirements with markers.

* Better handling of file URLs

  This allows for using ``file:///absolute/path``, which was previously
  prevented due to the missing ``netloc``.

  This allows for all file URLs that ``urlunparse`` turns back into the
  original URL to be valid.


18.0 - 2018-09-26
~~~~~~~~~~~~~~~~~

* Improve error messages when invalid requirements are given. (`#129 <https://github.com/pypa/packaging/issues/129>`__)


17.1 - 2017-02-28
~~~~~~~~~~~~~~~~~

* Fix ``utils.canonicalize_version`` when supplying non PEP 440 versions.


17.0 - 2017-02-28
~~~~~~~~~~~~~~~~~

* Drop support for python 2.6, 3.2, and 3.3.

* Define minimal pyparsing version to 2.0.2 (`#91 <https://github.com/pypa/packaging/issues/91>`__).

* Add ``epoch``, ``release``, ``pre``, ``dev``, and ``post`` attributes to
  ``Version`` and ``LegacyVersion`` (`#34 <https://github.com/pypa/packaging/issues/34>`__).

* Add ``Version().is_devrelease`` and ``LegacyVersion().is_devrelease`` to
  make it easy to determine if a release is a development release.

* Add ``utils.canonicalize_version`` to canonicalize version strings or
  ``Version`` instances (`#121 <https://github.com/pypa/packaging/issues/121>`__).


16.8 - 2016-10-29
~~~~~~~~~~~~~~~~~

* Fix markers that utilize ``in`` so that they render correctly.

* Fix an erroneous test on Python RC releases.


16.7 - 2016-04-23
~~~~~~~~~~~~~~~~~

* Add support for the deprecated ``python_implementation`` marker which was
  an undocumented setuptools marker in addition to the newer markers.


16.6 - 2016-03-29
~~~~~~~~~~~~~~~~~

* Add support for the deprecated, PEP 345 environment markers in addition to
  the newer markers.


16.5 - 2016-02-26
~~~~~~~~~~~~~~~~~

* Fix a regression in parsing requirements with whitespaces between the comma
  separators.


16.4 - 2016-02-22
~~~~~~~~~~~~~~~~~

* Fix a regression in parsing requirements like ``foo (==4)``.


16.3 - 2016-02-21
~~~~~~~~~~~~~~~~~

* Fix a bug where ``packaging.requirements:Requirement`` was overly strict when
  matching legacy requirements.


16.2 - 2016-02-09
~~~~~~~~~~~~~~~~~

* Add a function that implements the name canonicalization from PEP 503.


16.1 - 2016-02-07
~~~~~~~~~~~~~~~~~

* Implement requirement specifiers from PEP 508.


16.0 - 2016-01-19
~~~~~~~~~~~~~~~~~

* Relicense so that packaging is available under *either* the Apache License,
  Version 2.0 or a 2 Clause BSD license.

* Support installation of packaging when only distutils is available.

* Fix ``==`` comparison when there is a prefix and a local version in play.
  (`#41 <https://github.com/pypa/packaging/issues/41>`__).

* Implement environment markers from PEP 508.


15.3 - 2015-08-01
~~~~~~~~~~~~~~~~~

* Normalize post-release spellings for rev/r prefixes. `#35 <https://github.com/pypa/packaging/issues/35>`__


15.2 - 2015-05-13
~~~~~~~~~~~~~~~~~

* Fix an error where the arbitrary specifier (``===``) was not correctly
  allowing pre-releases when it was being used.

* Expose the specifier and version parts through properties on the
  ``Specifier`` classes.

* Allow iterating over the ``SpecifierSet`` to get access to all of the
  ``Specifier`` instances.

* Allow testing if a version is contained within a specifier via the ``in``
  operator.


15.1 - 2015-04-13
~~~~~~~~~~~~~~~~~

* Fix a logic error that was causing inconsistent answers about whether or not
  a pre-release was contained within a ``SpecifierSet`` or not.


15.0 - 2015-01-02
~~~~~~~~~~~~~~~~~

* Add ``Version().is_postrelease`` and ``LegacyVersion().is_postrelease`` to
  make it easy to determine if a release is a post release.

* Add ``Version().base_version`` and ``LegacyVersion().base_version`` to make
  it easy to get the public version without any pre or post release markers.

* Support the update to PEP 440 which removed the implied ``!=V.*`` when using
  either ``>V`` or ``<V`` and which instead special cased the handling of
  pre-releases, post-releases, and local versions when using ``>V`` or ``<V``.


14.5 - 2014-12-17
~~~~~~~~~~~~~~~~~

* Normalize release candidates as ``rc`` instead of ``c``.

* Expose the ``VERSION_PATTERN`` constant, a regular expression matching
  a valid version.


14.4 - 2014-12-15
~~~~~~~~~~~~~~~~~

* Ensure that versions are normalized before comparison when used in a
  specifier with a less than (``<``) or greater than (``>``) operator.


14.3 - 2014-11-19
~~~~~~~~~~~~~~~~~

* **BACKWARDS INCOMPATIBLE** Refactor specifier support so that it can sanely
  handle legacy specifiers as well as PEP 440 specifiers.

* **BACKWARDS INCOMPATIBLE** Move the specifier support out of
  ``packaging.version`` into ``packaging.specifiers``.


14.2 - 2014-09-10
~~~~~~~~~~~~~~~~~

* Add prerelease support to ``Specifier``.
* Remove the ability to do ``item in Specifier()`` and replace it with
  ``Specifier().contains(item)`` in order to allow flags that signal if a
  prerelease should be accepted or not.
* Add a method ``Specifier().filter()`` which will take an iterable and returns
  an iterable with items that do not match the specifier filtered out.


14.1 - 2014-09-08
~~~~~~~~~~~~~~~~~

* Allow ``LegacyVersion`` and ``Version`` to be sorted together.
* Add ``packaging.version.parse()`` to enable easily parsing a version string
  as either a ``Version`` or a ``LegacyVersion`` depending on it's PEP 440
  validity.


14.0 - 2014-09-05
~~~~~~~~~~~~~~~~~

* Initial release.


.. _`master`: https://github.com/pypa/packaging/



            

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    "description": "packaging\n=========\n\n.. start-intro\n\nReusable core utilities for various Python Packaging\n`interoperability specifications <https://packaging.python.org/specifications/>`_.\n\nThis library provides utilities that implement the interoperability\nspecifications which have clearly one correct behaviour (eg: :pep:`440`)\nor benefit greatly from having a single shared implementation (eg: :pep:`425`).\n\n.. end-intro\n\nThe ``packaging`` project includes the following: version handling, specifiers,\nmarkers, requirements, tags, utilities.\n\nDocumentation\n-------------\n\nThe `documentation`_ provides information and the API for the following:\n\n- Version Handling\n- Specifiers\n- Markers\n- Requirements\n- Tags\n- Utilities\n\nInstallation\n------------\n\nUse ``pip`` to install these utilities::\n\n    pip install packaging\n\nDiscussion\n----------\n\nIf you run into bugs, you can file them in our `issue tracker`_.\n\nYou can also join ``#pypa`` on Freenode to ask questions or get involved.\n\n\n.. _`documentation`: https://packaging.pypa.io/\n.. _`issue tracker`: https://github.com/pypa/packaging/issues\n\n\nCode of Conduct\n---------------\n\nEveryone interacting in the packaging project's codebases, issue trackers, chat\nrooms, and mailing lists is expected to follow the `PSF Code of Conduct`_.\n\n.. _PSF Code of Conduct: https://github.com/pypa/.github/blob/main/CODE_OF_CONDUCT.md\n\nContributing\n------------\n\nThe ``CONTRIBUTING.rst`` file outlines how to contribute to this project as\nwell as how to report a potential security issue. The documentation for this\nproject also covers information about `project development`_ and `security`_.\n\n.. _`project development`: https://packaging.pypa.io/en/latest/development/\n.. _`security`: https://packaging.pypa.io/en/latest/security/\n\nProject History\n---------------\n\nPlease review the ``CHANGELOG.rst`` file or the `Changelog documentation`_ for\nrecent changes and project history.\n\n.. _`Changelog documentation`: https://packaging.pypa.io/en/latest/changelog/\n\nChangelog\n---------\n\n21.0 - 2021-07-03\n~~~~~~~~~~~~~~~~~\n\n* `packaging` is now only compatible with Python 3.6 and above.\n* Add support for zip files in ``parse_sdist_filename`` (`#429 <https://github.com/pypa/packaging/issues/429>`__)\n\n20.9 - 2021-01-29\n~~~~~~~~~~~~~~~~~\n\n* Run `isort <https://pypi.org/project/isort/>`_ over the code base (`#377 <https://github.com/pypa/packaging/issues/377>`__)\n* Add support for the ``macosx_10_*_universal2`` platform tags (`#379 <https://github.com/pypa/packaging/issues/379>`__)\n* Introduce ``packaging.utils.parse_wheel_filename()`` and ``parse_sdist_filename()``\n  (`#387 <https://github.com/pypa/packaging/issues/387>`__ and `#389 <https://github.com/pypa/packaging/issues/389>`__)\n\n20.8 - 2020-12-11\n~~~~~~~~~~~~~~~~~\n\n* Revert back to setuptools for compatibility purposes for some Linux distros (`#363 <https://github.com/pypa/packaging/issues/363>`__)\n* Do not insert an underscore in wheel tags when the interpreter version number\n  is more than 2 digits (`#372 <https://github.com/pypa/packaging/issues/372>`__)\n\n20.7 - 2020-11-28\n~~~~~~~~~~~~~~~~~\n\nNo unreleased changes.\n\n20.6 - 2020-11-28\n~~~~~~~~~~~~~~~~~\n\n.. note:: This release was subsequently yanked, and these changes were included in 20.7.\n\n* Fix flit configuration, to include LICENSE files (`#357 <https://github.com/pypa/packaging/issues/357>`__)\n* Make `intel` a recognized CPU architecture for the `universal` macOS platform tag (`#361 <https://github.com/pypa/packaging/issues/361>`__)\n* Add some missing type hints to `packaging.requirements` (issue:`350`)\n\n20.5 - 2020-11-27\n~~~~~~~~~~~~~~~~~\n\n* Officially support Python 3.9 (`#343 <https://github.com/pypa/packaging/issues/343>`__)\n* Deprecate the ``LegacyVersion`` and ``LegacySpecifier`` classes (`#321 <https://github.com/pypa/packaging/issues/321>`__)\n* Handle ``OSError`` on non-dynamic executables when attempting to resolve\n  the glibc version string.\n\n20.4 - 2020-05-19\n~~~~~~~~~~~~~~~~~\n\n* Canonicalize version before comparing specifiers. (`#282 <https://github.com/pypa/packaging/issues/282>`__)\n* Change type hint for ``canonicalize_name`` to return\n  ``packaging.utils.NormalizedName``.\n  This enables the use of static typing tools (like mypy) to detect mixing of\n  normalized and un-normalized names.\n\n20.3 - 2020-03-05\n~~~~~~~~~~~~~~~~~\n\n* Fix changelog for 20.2.\n\n20.2 - 2020-03-05\n~~~~~~~~~~~~~~~~~\n\n* Fix a bug that caused a 32-bit OS that runs on a 64-bit ARM CPU (e.g. ARM-v8,\n  aarch64), to report the wrong bitness.\n\n20.1 - 2020-01-24\n~~~~~~~~~~~~~~~~~~~\n\n* Fix a bug caused by reuse of an exhausted iterator. (`#257 <https://github.com/pypa/packaging/issues/257>`__)\n\n20.0 - 2020-01-06\n~~~~~~~~~~~~~~~~~\n\n* Add type hints (`#191 <https://github.com/pypa/packaging/issues/191>`__)\n\n* Add proper trove classifiers for PyPy support (`#198 <https://github.com/pypa/packaging/issues/198>`__)\n\n* Scale back depending on ``ctypes`` for manylinux support detection (`#171 <https://github.com/pypa/packaging/issues/171>`__)\n\n* Use ``sys.implementation.name`` where appropriate for ``packaging.tags`` (`#193 <https://github.com/pypa/packaging/issues/193>`__)\n\n* Expand upon the API provided by ``packaging.tags``: ``interpreter_name()``, ``mac_platforms()``, ``compatible_tags()``, ``cpython_tags()``, ``generic_tags()`` (`#187 <https://github.com/pypa/packaging/issues/187>`__)\n\n* Officially support Python 3.8 (`#232 <https://github.com/pypa/packaging/issues/232>`__)\n\n* Add ``major``, ``minor``, and ``micro`` aliases to ``packaging.version.Version`` (`#226 <https://github.com/pypa/packaging/issues/226>`__)\n\n* Properly mark ``packaging`` has being fully typed by adding a `py.typed` file (`#226 <https://github.com/pypa/packaging/issues/226>`__)\n\n19.2 - 2019-09-18\n~~~~~~~~~~~~~~~~~\n\n* Remove dependency on ``attrs`` (`#178 <https://github.com/pypa/packaging/issues/178>`__, `#179 <https://github.com/pypa/packaging/issues/179>`__)\n\n* Use appropriate fallbacks for CPython ABI tag (`#181 <https://github.com/pypa/packaging/issues/181>`__, `#185 <https://github.com/pypa/packaging/issues/185>`__)\n\n* Add manylinux2014 support (`#186 <https://github.com/pypa/packaging/issues/186>`__)\n\n* Improve ABI detection (`#181 <https://github.com/pypa/packaging/issues/181>`__)\n\n* Properly handle debug wheels for Python 3.8 (`#172 <https://github.com/pypa/packaging/issues/172>`__)\n\n* Improve detection of debug builds on Windows (`#194 <https://github.com/pypa/packaging/issues/194>`__)\n\n19.1 - 2019-07-30\n~~~~~~~~~~~~~~~~~\n\n* Add the ``packaging.tags`` module. (`#156 <https://github.com/pypa/packaging/issues/156>`__)\n\n* Correctly handle two-digit versions in ``python_version`` (`#119 <https://github.com/pypa/packaging/issues/119>`__)\n\n\n19.0 - 2019-01-20\n~~~~~~~~~~~~~~~~~\n\n* Fix string representation of PEP 508 direct URL requirements with markers.\n\n* Better handling of file URLs\n\n  This allows for using ``file:///absolute/path``, which was previously\n  prevented due to the missing ``netloc``.\n\n  This allows for all file URLs that ``urlunparse`` turns back into the\n  original URL to be valid.\n\n\n18.0 - 2018-09-26\n~~~~~~~~~~~~~~~~~\n\n* Improve error messages when invalid requirements are given. (`#129 <https://github.com/pypa/packaging/issues/129>`__)\n\n\n17.1 - 2017-02-28\n~~~~~~~~~~~~~~~~~\n\n* Fix ``utils.canonicalize_version`` when supplying non PEP 440 versions.\n\n\n17.0 - 2017-02-28\n~~~~~~~~~~~~~~~~~\n\n* Drop support for python 2.6, 3.2, and 3.3.\n\n* Define minimal pyparsing version to 2.0.2 (`#91 <https://github.com/pypa/packaging/issues/91>`__).\n\n* Add ``epoch``, ``release``, ``pre``, ``dev``, and ``post`` attributes to\n  ``Version`` and ``LegacyVersion`` (`#34 <https://github.com/pypa/packaging/issues/34>`__).\n\n* Add ``Version().is_devrelease`` and ``LegacyVersion().is_devrelease`` to\n  make it easy to determine if a release is a development release.\n\n* Add ``utils.canonicalize_version`` to canonicalize version strings or\n  ``Version`` instances (`#121 <https://github.com/pypa/packaging/issues/121>`__).\n\n\n16.8 - 2016-10-29\n~~~~~~~~~~~~~~~~~\n\n* Fix markers that utilize ``in`` so that they render correctly.\n\n* Fix an erroneous test on Python RC releases.\n\n\n16.7 - 2016-04-23\n~~~~~~~~~~~~~~~~~\n\n* Add support for the deprecated ``python_implementation`` marker which was\n  an undocumented setuptools marker in addition to the newer markers.\n\n\n16.6 - 2016-03-29\n~~~~~~~~~~~~~~~~~\n\n* Add support for the deprecated, PEP 345 environment markers in addition to\n  the newer markers.\n\n\n16.5 - 2016-02-26\n~~~~~~~~~~~~~~~~~\n\n* Fix a regression in parsing requirements with whitespaces between the comma\n  separators.\n\n\n16.4 - 2016-02-22\n~~~~~~~~~~~~~~~~~\n\n* Fix a regression in parsing requirements like ``foo (==4)``.\n\n\n16.3 - 2016-02-21\n~~~~~~~~~~~~~~~~~\n\n* Fix a bug where ``packaging.requirements:Requirement`` was overly strict when\n  matching legacy requirements.\n\n\n16.2 - 2016-02-09\n~~~~~~~~~~~~~~~~~\n\n* Add a function that implements the name canonicalization from PEP 503.\n\n\n16.1 - 2016-02-07\n~~~~~~~~~~~~~~~~~\n\n* Implement requirement specifiers from PEP 508.\n\n\n16.0 - 2016-01-19\n~~~~~~~~~~~~~~~~~\n\n* Relicense so that packaging is available under *either* the Apache License,\n  Version 2.0 or a 2 Clause BSD license.\n\n* Support installation of packaging when only distutils is available.\n\n* Fix ``==`` comparison when there is a prefix and a local version in play.\n  (`#41 <https://github.com/pypa/packaging/issues/41>`__).\n\n* Implement environment markers from PEP 508.\n\n\n15.3 - 2015-08-01\n~~~~~~~~~~~~~~~~~\n\n* Normalize post-release spellings for rev/r prefixes. `#35 <https://github.com/pypa/packaging/issues/35>`__\n\n\n15.2 - 2015-05-13\n~~~~~~~~~~~~~~~~~\n\n* Fix an error where the arbitrary specifier (``===``) was not correctly\n  allowing pre-releases when it was being used.\n\n* Expose the specifier and version parts through properties on the\n  ``Specifier`` classes.\n\n* Allow iterating over the ``SpecifierSet`` to get access to all of the\n  ``Specifier`` instances.\n\n* Allow testing if a version is contained within a specifier via the ``in``\n  operator.\n\n\n15.1 - 2015-04-13\n~~~~~~~~~~~~~~~~~\n\n* Fix a logic error that was causing inconsistent answers about whether or not\n  a pre-release was contained within a ``SpecifierSet`` or not.\n\n\n15.0 - 2015-01-02\n~~~~~~~~~~~~~~~~~\n\n* Add ``Version().is_postrelease`` and ``LegacyVersion().is_postrelease`` to\n  make it easy to determine if a release is a post release.\n\n* Add ``Version().base_version`` and ``LegacyVersion().base_version`` to make\n  it easy to get the public version without any pre or post release markers.\n\n* Support the update to PEP 440 which removed the implied ``!=V.*`` when using\n  either ``>V`` or ``<V`` and which instead special cased the handling of\n  pre-releases, post-releases, and local versions when using ``>V`` or ``<V``.\n\n\n14.5 - 2014-12-17\n~~~~~~~~~~~~~~~~~\n\n* Normalize release candidates as ``rc`` instead of ``c``.\n\n* Expose the ``VERSION_PATTERN`` constant, a regular expression matching\n  a valid version.\n\n\n14.4 - 2014-12-15\n~~~~~~~~~~~~~~~~~\n\n* Ensure that versions are normalized before comparison when used in a\n  specifier with a less than (``<``) or greater than (``>``) operator.\n\n\n14.3 - 2014-11-19\n~~~~~~~~~~~~~~~~~\n\n* **BACKWARDS INCOMPATIBLE** Refactor specifier support so that it can sanely\n  handle legacy specifiers as well as PEP 440 specifiers.\n\n* **BACKWARDS INCOMPATIBLE** Move the specifier support out of\n  ``packaging.version`` into ``packaging.specifiers``.\n\n\n14.2 - 2014-09-10\n~~~~~~~~~~~~~~~~~\n\n* Add prerelease support to ``Specifier``.\n* Remove the ability to do ``item in Specifier()`` and replace it with\n  ``Specifier().contains(item)`` in order to allow flags that signal if a\n  prerelease should be accepted or not.\n* Add a method ``Specifier().filter()`` which will take an iterable and returns\n  an iterable with items that do not match the specifier filtered out.\n\n\n14.1 - 2014-09-08\n~~~~~~~~~~~~~~~~~\n\n* Allow ``LegacyVersion`` and ``Version`` to be sorted together.\n* Add ``packaging.version.parse()`` to enable easily parsing a version string\n  as either a ``Version`` or a ``LegacyVersion`` depending on it's PEP 440\n  validity.\n\n\n14.0 - 2014-09-05\n~~~~~~~~~~~~~~~~~\n\n* Initial release.\n\n\n.. _`master`: https://github.com/pypa/packaging/\n\n\n",
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