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docs: prepare for 26.0 final (#1063)
* docs: prepare for 26.0 final Signed-off-by: Henry Schreiner <[email protected]> * Add recent perf PR * docs: mention RCs Signed-off-by: Henry Schreiner <[email protected]> --------- Signed-off-by: Henry Schreiner <[email protected]>
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‎CHANGELOG.rst‎

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*unreleased*
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~~~~~~~~~~~~
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Fixes:
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* Restore ``Version._version`` as a compatibility shim with a ``DeprecationWarning`` (:pull:`1062`)
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26.0rc3 - 2026-01-15
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~~~~~~~~~~~~~~~~~~~~
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Fixes:
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* Support CPython 3.11.0-3.11.4 and older PyPy3.11 (:pull:`1055`)
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Performance:
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* Faster zero stripping (:pull:`1058`)
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CI:
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* Test on first public release of CPython 3.11 and newer (:pull:`1056`)
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* Fix publication job (again) (:pull:`1051`)
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* Use ``actionlint`` to check CI workflows (:pull:`1052`)
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26.0rc2 - 2026-01-12
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~~~~~~~~~~~~~~~~~~~~
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Fixes:
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* Fix regression in (private) ``Version._key`` for ``packaging_legacy`` by @henryiii in https://github.com/pypa/packaging/pull/1048
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Performance:
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* Tiny import time improvement and simplification by @henryiii in https://github.com/pypa/packaging/pull/1047
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Internal:
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* Fix type hint of function used with ``contextlib.contextmanager`` by @SpecLad in https://github.com/pypa/packaging/pull/1046
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* Fix the publish job by @henryiii in https://github.com/pypa/packaging/pull/1043
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* Get the correct tag on publish by @henryiii in https://github.com/pypa/packaging/pull/1045
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26.0rc1 - 2026-01-09
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~~~~~~~~~~~~~~~~~~~~
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Features:
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* PEP 751: support pylock (:pull:`900`)
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* Cache the ``Specifier``'s ``Version`` (:pull:`985`)
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* Make ``Version`` a little faster (:pull:`987`)
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* Minor ``Version`` regex cleanup (:pull:`990`)
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* Faster regex on Python 3.11+ for ``Version`` (:pull:`988`)
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* Lazily calculate ``_key`` in ``Version`` (:pull:`989`)
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* Faster regex on Python 3.11.5+ for ``Version`` (:pull:`988`, :pull:`1055`)
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* Lazily calculate ``_key`` in ``Version`` (:pull:`989`, :pull:`1048`)
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* Faster ``canonicalize_version`` (:pull:`993`)
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* Use ``re.fullmatch`` in a couple more places (:pull:`992`, :pull:`1029`)
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* Use ``map`` instead of generator (:pull:`996`)
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* Drop ``._version`` (``_Version``, a ``NamedTuple``) (:pull:`995`)
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* Deprecate ``._version`` (``_Version``, a ``NamedTuple``) (:pull:`995`, :pull:`1062`)
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* Avoid duplicate ``Version`` creation in ``canonicalize_version`` (:pull:`994`)
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* Add ``__slots__`` to core classes (:pull:`1001`, :pull:`1002`, :pull:`1032`)
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* Use ``Version.__replace__`` in specifier comparison (:pull:`999`)
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* Use ``str.partition`` in ``_parse_project_urls`` (:pull:`1013`)
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* Avoid normalizing extras again when comparing (:pull:`1028`)
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* Speed up ``Version.__str__`` by about 10% (:pull:`997`)
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* Double the performance of ``canonicalize_name`` by avoiding a regex (:pull:`1030`)
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* Much faster ``canonicalize_name`` by avoiding a regex (:pull:`1030`, :pull:`1047`, :pull:`1064`)
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* Faster zero stripping (:pull:`1058`)
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Type annotations:
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* Fix a type annotation (:pull:`907`)
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* Fix type hint of function used with ``contextlib.contextmanager`` (:pull:`1046`)
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* Fix tags return type in ``parse_wheel_filename`` docs (:pull:`973`)
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* Add type hint for ``_version`` in ``.version.Version`` (:pull:`927`)
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* Changed static type annotations in prereleases setter method in ``specifier.py`` (:pull:`930`)
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* Simpler else instead of assert in a check (:pull:`1027`, :pull:`1031`)
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* Synchronize documentation and code for markers (:pull:`1008`)
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* Use the GitHub Actions slim runner for the all pass check (:pull:`1021`)
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* Use Trusted Publishing (:pull:`893`)
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* Use ``actionlint`` to check CI workflows (:pull:`1052`)
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* Use Trusted Publishing (:pull:`893`, :pull:`1043`, :pull:`1045`, :pull:`1051`)
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* Use zizmor to check CI (:pull:`1035`)
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* Test on first public release of CPython 3.11 and newer (:pull:`1056`)
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Since the final release candidate: Faster ``canonicalize_name``, especially on
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Python 3.12 and 3.13, where performance regressed previously (:pull:`1064`),
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and reintroduce (deprecated) support for ``Version._.version`` (:pull:`1062`).
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26.0rc3 - 2026-01-15
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~~~~~~~~~~~~~~~~~~~~
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Third release candidate for 26.0. Avoid bug in CPython 3.11.0-3.11.4 and older
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PyPy 3.11 (:pull:`1055`).
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26.0rc2 - 2026-01-12
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~~~~~~~~~~~~~~~~~~~~
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Second release candidate for 26.0. Fixed a regression in (private)
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``Version._key`` for ``packaging_legacy`` (:pull:`1048`), and speed up
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stripping zeros a little more (:pull:`1058`).
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26.0rc1 - 2026-01-09
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~~~~~~~~~~~~~~~~~~~~
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First release candidate for 26.0.
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25.0 - 2025-04-19
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~~~~~~~~~~~~~~~~~

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