packaging 26.1 on Python PyPI

Features:

PEP 783: add handling for Emscripten wheel tags by @hoodmane in #804
PEP 803: add handling for the abi3.abi3t free-threading tag by @ngoldbaum in #1099
PEP 723: add packaging.dependency_groups module, based on the dependency-groups package by @sirosen in #1065
Add the packaging.direct_url module by @sbidoul in #944
Add the packaging.errors module by @henryiii in #1071
Add SpecifierSet.is_unsatisfiable using ranges (new internals that will be expanded in future versions) by @notatallshaw in #1119
Add create_compatible_tags_selector to select compatible tags by @sbidoul in #1110
Add a key argument to SpecifierSet.filter() by @frostming in #1068
Support & and | for Marker's by @henryiii in #1146
Normalize Version.__replace__ and add Version.from_parts by @henryiii in #1078
Add an option to validate compressed tag set sort order in parse_wheel_filename by @r266-tech in #1150

Behavior adaptations:

Narrow exclusion of pre-releases for <V.postN to match spec by @notatallshaw in #1140
Narrow exclusion of post-releases for >V to match spec by @notatallshaw in #1141
Rename format_full_version to _format_full_version to make it visibly private by @r266-tech in #1125
Restrict local version to ASCII by @henryiii in #1102

Pylock (PEP 751) updates:

Add pylock select function by @sbidoul in #1092
Document pylock select() method and PylockSelectError by @r266-tech in #1153
Add filename property to PackageSdist and PackageWheel, more validation by @sbidoul in #1095
Give preference to path over url by @sbidoul in #1128
Validate name/version consistency in file names by @sbidoul in #1114

Fixes:

Fix > comparison for versions with dev+local segments by @veeceey in #1097
Fix incorrect self-comparison for InfinityType and NegativeInfinityType by @bysiber in #1093
Canonicalize when deduplicating specifiers in SpecifierSet by @notatallshaw in #1109
Fix charset error message formatting by @notatallshaw in #1121
Handle the key parameter in SpecifierSet.filter when specifiers are empty and prerelease is False by @notatallshaw in #1096
Standardize inner components of repr output by @henryiii in #1090
Specifier's === uses original string, not normalized, when available by @notatallshaw in #1124
Propagate int-max-str-digits ValueError by @notatallshaw in #1155

Performance:

Add fast path for parsing simple versions (digits and dots only) by @notatallshaw in #1082
Add fast path for Version to Version comparison by skipping _key property by @notatallshaw in #1083
Cache Version hash value in dedicated slot by @notatallshaw in #1118
Overhaul _cmpkey to remove use of custom objects by @notatallshaw in #1116
Skip __replace__ in Specifier comparison if not needed by @notatallshaw in #1081
SpecifierSet use tuple instead of frozenset for _specs by @notatallshaw in #1108
Speed up complex SpecifierSet filtering by implementing cost-based ordering by @notatallshaw in #1105
Speed up wildcard comparison by @notatallshaw in #1111
Stream PEP440 filtering in SpecifierSet.filter by @notatallshaw in #1076
Add __slots__ to Marker by @henryiii in #1147
Simply Specifier regex by @sirosen in #1106
Skip using the hash property internally by @notatallshaw in #1115

Internal:

Add downstream testing by @henryiii in #1049
Benchmarking suite by @henryiii in #1059
Benchmark variance reduction by @notatallshaw in #1107
Add property-based tests for PEP 440 by @notatallshaw in #1144
Clean up a few collections.namedtuple in tests by @henryiii in #1070
Do not reload the tags module in tests by @henryiii in #1152
Limit dir() / tab-completion in REPL by @henryiii in #1011
Add more __all__/__dir__ by @henryiii in #1069
Cleanup pre-commit a bit by @henryiii in #1080
Pin pre-commit file, use dependabot by @henryiii in #1133
Remove sphinx-toolbox by @henryiii in #1135
Use docs group, faster readthedocs by @henryiii in #1061
Add free-threaded Python to CI by @henryiii in #1098
Simplify combining SpecifierSet.prereleases by @notatallshaw in #1073
Use direct operator methods in _compare_compatible by @notatallshaw in #1100
Remove unnecessary if statement in Specifier.prereleases by @notatallshaw in #1074
Remove unneeded nesting in Specifier.prereleases by @notatallshaw in #1072

Documentation:

Fix documentation: grammar, typos, formatting, and outdated references by @DimitriPapadopoulos in #1084
Fix versionadded for Version.from_parts() by @Jackenmen in #1134
Document & and | operators for combining Marker objects by @r266-tech in #1151
Expand and clean up Version documentation by @henryiii in #1089
Move license docs inline by @henryiii in #1131
Move markers inline by @henryiii in #1104
Move tags docs to inline by @henryiii in #1130
Move utilities inline, like other modules by @henryiii in #1103

Benchmarks

Performance improvements since 26.0, from the new integrated benchmark suite:

uv run asv run 26.0..HEAD

Full Changelog: 26.0...26.1