Packaging

~~~~~~~~~~~~~~~~~

* Do specifier matching correctly when the specifier contains an epoch number
and has more components than the version (:issue:`683`)
* Support the experimental ``--disable-gil`` builds in packaging.tags
(:issue:`727`)
* BREAKING: Make optional ``metadata.Metadata`` attributes default to ``None`` (:issue:`733`)
* Fix errors when trying to access the ``description_content_type``, ``keywords``,
and ``requires_python`` attributes on ``metadata.Metadata`` when those values
have not been provided (:issue:`733`)
* Fix a bug preventing the use of the built in ``ExceptionGroup`` on versions of
Python that support it (:issue:`725`)

~~~~~~~~~~~~~~~~~

* Document calendar-based versioning scheme (:issue:`716`)
* Enforce that the entire marker string is parsed (:issue:`687`)
* Requirement parsing no longer automatically validates the URL (:issue:`120`)
* Canonicalize names for requirements comparison (:issue:`644`)
* Introduce ``metadata.Metadata`` (along with ``metadata.ExceptionGroup`` and ``metadata.InvalidMetadata``; :issue:`570`)
* Introduce the ``validate`` keyword parameter to ``utils.normalize_name()`` (:issue:`570`)
* Introduce ``utils.is_normalized_name()`` (:issue:`570`)
* Make ``utils.parse_sdist_filename()`` and ``utils.parse_wheel_filename()``
raise ``InvalidSdistFilename`` and ``InvalidWheelFilename``, respectively,
when the version component of the name is invalid

~~~~~~~~~~~~~~~~~

* Parse raw metadata (:issue:`671`)
* Import underlying parser functions as an underscored variable (:issue:`663`)
* Improve error for local version label with unsupported operators (:issue:`675`)
* Add dedicated error for specifiers with incorrect `.*` suffix
* Replace spaces in platform names with underscores (:issue:`620`)
* Relax typing of ``_key`` on ``_BaseVersion`` (:issue:`669`)
* Handle prefix match with zeros at end of prefix correctly (:issue:`674`)

~~~~~~~~~~~~~~~~~

* Allow ``"extra"`` to be ``None`` in the marker environment (:issue:`650`)
* Refactor ``tags._generic_api`` to use ``EXT_SUFFIX`` (:issue:`607`)
* Correctly handle trailing whitespace on URL requirements (:issue:`642`)
* Fix typing for ``specifiers.BaseSpecifier.filter()`` (:issue:`643`)
* Use stable Python 3.11 in tests (:issue:`641`)
* Correctly handle non-normalised specifiers in requirements (:issue:`634`)
* Move to ``src/`` layout (:issue:`626`)
* Remove ``__about__`` file, in favour of keeping constants in ``__init__`` (:issue:`626`)

~~~~~~~~~~~~~~~~~

* Explicitly declare support for Python 3.11 (:issue:`587`)
* Remove support for Python 3.6 (:issue:`500`)
* Remove ``LegacySpecifier`` and ``LegacyVersion`` (:issue:`407`)
* Add ``__hash__`` and ``__eq__`` to ``Requirement`` (:issue:`499`)
* Add a ``cpNNN-none-any`` tag (:issue:`541`)
* Adhere to :pep:`685` when evaluating markers with extras (:issue:`545`)
* Allow accepting locally installed prereleases with ``SpecifierSet`` (:issue:`515`)
* Allow pre-release versions in marker evaluation (:issue:`523`)
* Correctly parse ELF for musllinux on Big Endian (:issue:`538`)
* Document ``packaging.utils.NormalizedName`` (:issue:`565`)
* Document exceptions raised by functions in ``packaging.utils`` (:issue:`544`)
* Fix compatible version specifier incorrectly strip trailing ``0`` (:issue:`493`)
* Fix macOS platform tags with old macOS SDK (:issue:`513`)
* Forbid prefix version matching on pre-release/post-release segments (:issue:`563`)
* Normalize specifier version for prefix matching (:issue:`561`)
* Improve documentation for ``packaging.specifiers`` and ``packaging.version``. (:issue:`572`)
* ``Marker.evaluate`` will now assume evaluation environment with empty ``extra``.
Evaluating markers like ``"extra == 'xyz'"`` without passing any extra in the
``environment`` will no longer raise an exception (:issue:`550`)
* Remove dependency on ``pyparsing``, by replacing it with a hand-written parser.
This package now has no runtime dependencies (:issue:`468`)
* Update return type hint for ``Specifier.filter`` and ``SpecifierSet.filter``
to use ``Iterator`` instead of ``Iterable`` (:issue:`584`)

~~~~~~~~~~~~~~~~~

* Add a ``pp3-none-any`` tag (:issue:`311`)
* Replace the blank pyparsing 3 exclusion with a 3.0.5 exclusion (:issue:`481`, :issue:`486`)
* Fix a spelling mistake (:issue:`479`)