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perf: better string building#997

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henryiii merged 2 commits intopypa:mainfrom
henryiii:henryiii/perf/str
Jan 6, 2026
Merged

perf: better string building#997
henryiii merged 2 commits intopypa:mainfrom
henryiii:henryiii/perf/str

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@henryiii
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@henryiii henryiii commented Nov 27, 2025

This makes the __str__ method faster, about 10%. This is used quite a bit, so saving some time here is useful.

@henryiii henryiii force-pushed the henryiii/perf/str branch 3 times, most recently from 267b5d9 to e584ec3 Compare November 27, 2025 16:14
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henryiii commented Nov 27, 2025

Almost all the savings here was from avoiding the NamedTuple indirection. This is now only 1% faster total time, probably 5% or something like that faster for the str operation. Saving the intermediate value doesn't have any measurable effect anymore, so I've remove that.

Now it's mostly up to if you think this looks better (and it still is a little faster).

@brettcannon
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Now it's mostly up to if you think this looks better

I'm indifferent.

@notatallshaw
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"".join(...) reads better to me because I've written that pattern so often in Python, but that's just anecdotal.

I was also under the impression, apparently incorrectly, that join would be faster. Because naively concatenating strings can be O(n^2) with regards to memory allocation operations, and I thought the .join method had some kind of optimization to handle that. Maybe this is just too few concatenations with too small strings where the memory allocations become a dominating factor.

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I'm nearly sure it's the fact the strings are generally small. If they were large I'm almost sure it would be the other way around.

I played around with several ways to do this - I thought making all four separately then using an f-string to join them would be fastest, but short circuiting if None was too important. Now that the largest cost (accessing the nested field in the NamedTuple) is gone, it's possible that is faster.

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I was also under the impression, apparently incorrectly, that join would be faster. Because naively concatenating strings can be O(n^2) with regards to memory allocation operations, and I thought the .join method had some kind of optimization to handle that. Maybe this is just too few concatenations with too small strings where the memory allocations become a dominating factor.

There's an optimization in CPython specifically for += in a loop. So you're right that str.join() should be faster, but we cheated in CPython. 😁

@henryiii henryiii force-pushed the henryiii/perf/str branch 4 times, most recently from 624a237 to 4a4953d Compare January 5, 2026 16:50
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henryiii commented Jan 5, 2026

Okay, after one more change (inlining base_version), now this is much faster, around 10%.

All benchmarks:

Change Before [3803ce3] After [4a4953d] <henryiii/perf/str> Ratio Benchmark (Parameter)
2.30±0.01ms 2.31±0.01ms 1.01 markers.TimeMarkerSuite.time_constructor
1.20±0.02ms 1.15±0.05ms 0.95 markers.TimeMarkerSuite.time_evaluate
9.88±0.4ms 9.68±0.7ms 0.98 requirement.TimeRequirementSuite.time_constructor
601±8μs 605±70μs 1.01 resolver.TimeResolverSuite.time_resolver_loop
3.43±0.04ms 3.33±0.03ms 0.97 specifiers.TimeSpecSuite.time_constructor
4.09±0.02ms 4.00±0.03ms 0.98 specifiers.TimeSpecSuite.time_contains
61.5±0.3μs 61.2±0.3μs 1 specifiers.TimeSpecSuite.time_filter
3.99±0.04μs 4.04±0.04μs 1.01 utils.TimeUtils.time_canonicalize_name
1.97±0.01ms 1.98±0ms 1.01 version.TimeVersionSuite.time_constructor
1.87±0.01ms 1.87±0.01ms 1 version.TimeVersionSuite.time_sort
- 811±6μs 728±9μs 0.9 version.TimeVersionSuite.time_str

Signed-off-by: Henry Schreiner <[email protected]>

chore: remove saving intermediate (no longer much faster)

Signed-off-by: Henry Schreiner <[email protected]>
Signed-off-by: Henry Schreiner <[email protected]>
@henryiii henryiii merged commit 65092ce into pypa:main Jan 6, 2026
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@henryiii henryiii deleted the henryiii/perf/str branch January 6, 2026 00:00
radermacher-iits pushed a commit to kubara-io/kubara that referenced this pull request Feb 19, 2026
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [packaging](https://github.com/pypa/packaging) | packages | major | `==25.0` → `==26.0` |

---

### Release Notes

<details>
<summary>pypa/packaging (packaging)</summary>

### [`v26.0`](https://github.com/pypa/packaging/releases/tag/26.0)

[Compare Source](pypa/packaging@25.0...26.0)

Read about the performance improvements here: <https://iscinumpy.dev/post/packaging-faster>.

#### What's Changed

Features:

- PEP 751: support pylock by [@&#8203;sbidoul](https://github.com/sbidoul) in [#&#8203;900](pypa/packaging#900)
- PEP 794: import name metadata by [@&#8203;brettcannon](https://github.com/brettcannon) in [#&#8203;948](pypa/packaging#948)
- Support writing metadata by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;846](pypa/packaging#846)
- Support `__replace__` for `Version` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1003](pypa/packaging#1003)
- Support positional pattern matching for `Version` and `Specifier` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1004](pypa/packaging#1004)

Behavior adaptations:

- PEP 440 handling of prereleases for `Specifier.contains`, `SpecifierSet.contains`, and `SpecifierSet.filter` by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;897](pypa/packaging#897)
- Handle PEP 440 edge case in `SpecifierSet.filter` by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;942](pypa/packaging#942)
- Adjust arbitrary equality intersection preservation in `SpecifierSet` by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;951](pypa/packaging#951)
- Return `False` instead of raising for `.contains` with invalid version by [@&#8203;Liam-DeVoe](https://github.com/Liam-DeVoe) in [#&#8203;932](pypa/packaging#932)
- Support arbitrary equality on arbitrary strings for `Specifier` and `SpecifierSet`'s `filter` and `contains` method. by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;954](pypa/packaging#954)
- Only try to parse as `Version` on certain marker keys, return `False` on unequal ordered comparsions by [@&#8203;JP-Ellis](https://github.com/JP-Ellis) in [#&#8203;939](pypa/packaging#939)

Fixes:

- Update `_hash` when unpickling `Tag()` by [@&#8203;dholth](https://github.com/dholth) in [#&#8203;860](pypa/packaging#860)
- Correct comment and simplify implicit prerelease handling in `Specifier.prereleases` by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;896](pypa/packaging#896)
- Use explicit `_GLibCVersion` `NamedTuple` in `_manylinux` by [@&#8203;cthoyt](https://github.com/cthoyt) in [#&#8203;868](pypa/packaging#868)
- Detect invalid license expressions containing `()` by [@&#8203;bwoodsend](https://github.com/bwoodsend) in [#&#8203;879](pypa/packaging#879)
- Correct regex for metadata `'name'` format by [@&#8203;di](https://github.com/di) in [#&#8203;925](pypa/packaging#925)
- Improve the message around expecting a semicolon by [@&#8203;pradyunsg](https://github.com/pradyunsg) in [#&#8203;833](pypa/packaging#833)
- Support nested parens in license expressions by [@&#8203;Liam-DeVoe](https://github.com/Liam-DeVoe) in [#&#8203;931](pypa/packaging#931)
- Add space before at symbol in `Requirements` string by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;953](pypa/packaging#953)
- A root logger use found by ruff LOG, use `packaging` logger instead by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;965](pypa/packaging#965)
- Better support for subclassing `Marker` and `Requirement` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1022](pypa/packaging#1022)
- Normalize all extras, not just if it comes first by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1024](pypa/packaging#1024)
- Don't produce a broken repr if `Marker` fails to construct by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1033](pypa/packaging#1033)

Performance:

- Avoid recompiling regexes in the tokenizer for a 3x speedup by [@&#8203;hauntsaninja](https://github.com/hauntsaninja) in [#&#8203;1019](pypa/packaging#1019)
- Improve performance in `_manylinux.py` by [@&#8203;cthoyt](https://github.com/cthoyt) in [#&#8203;869](pypa/packaging#869)
- Minor cleanups to `Version` by [@&#8203;bearomorphism](https://github.com/bearomorphism) in [#&#8203;913](pypa/packaging#913)
- Skip redundant creation of `Version`s in specifier comparison by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;986](pypa/packaging#986)
- Cache `Specifier`'s Version by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;985](pypa/packaging#985)
- Make `Version` a little faster by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;987](pypa/packaging#987)
- Minor `Version` regex cleanup by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;990](pypa/packaging#990)
- Faster regex on Python 3.11.5+ by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;988](pypa/packaging#988) and [#&#8203;1055](pypa/packaging#1055)
- Lazily calculate `_key` in `Version` by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;989](pypa/packaging#989) and regression for `packaging_legacy` fixed by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1048](pypa/packaging#1048)
- Faster `canonicalize_version` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;993](pypa/packaging#993)
- Use `fullmatch` in a couple more places by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;992](pypa/packaging#992)
- Use `fullmatch` for markers too by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1029](pypa/packaging#1029)
- Use `map` instead of generator by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;996](pypa/packaging#996)
- Deprecate `._version` (`_Version`, a `NamedTuple`) by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;995](pypa/packaging#995) and [#&#8203;1062](pypa/packaging#1062)
- Avoid duplicate `Version` creation in `canonicalize_version` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;994](pypa/packaging#994)
- Add `__slots__` to `Version` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1001](pypa/packaging#1001)
- Add `__slots__` to `Specifier`s by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1002](pypa/packaging#1002)
- Add `__slots__` to `Node`s by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1032](pypa/packaging#1032)
- Use `version.__replace__` in specifier comparison by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;999](pypa/packaging#999)
- Use `_get_spec_version` in more places in `Specifier` by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;1005](pypa/packaging#1005)
- Pull `set` construction out of function by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1012](pypa/packaging#1012)
- Letter normalization dict for prereleases and the like by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1014](pypa/packaging#1014)
- Avoid normalizing extras again when comparing by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1028](pypa/packaging#1028)
- Speed up `Version.__str__` by about 10% by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;997](pypa/packaging#997)
- Increase the performance of `canonicalize_name` by avoiding a regex by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1030](pypa/packaging#1030), [#&#8203;1047](pypa/packaging#1047), and [#&#8203;1064](pypa/packaging#1064)
- Faster zero stripping by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1058](pypa/packaging#1058)

Type annotations:

- Fix a type annotation by [@&#8203;brettcannon](https://github.com/brettcannon) in [#&#8203;907](pypa/packaging#907)
- Fix tags return type in `parse_wheel_filename` docs by [@&#8203;ncoghlan](https://github.com/ncoghlan) in [#&#8203;973](pypa/packaging#973)
- Add type hint for `_version` in `.version.Version` by [@&#8203;brettcannon](https://github.com/brettcannon) in [#&#8203;927](pypa/packaging#927)
- Changed static type annotations in prereleases setter method in `specifier.py` by [@&#8203;subhajitsaha01](https://github.com/subhajitsaha01) in [#&#8203;930](pypa/packaging#930)
- Statically type the tests by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;982](pypa/packaging#982)

Internal:

- Test and declare support Python 3.14 by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;901](pypa/packaging#901)
- Modernize and speed up tests on Python 3.14 by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;903](pypa/packaging#903)
- Change our license metadata to use an SPDX license expression by [@&#8203;cdce8p](https://github.com/cdce8p) in [#&#8203;881](pypa/packaging#881)
- No need for `license-files` by [@&#8203;DimitriPapadopoulos](https://github.com/DimitriPapadopoulos) in [#&#8203;924](pypa/packaging#924)
- Update mypy by [@&#8203;hauntsaninja](https://github.com/hauntsaninja) in [#&#8203;891](pypa/packaging#891)
- Some config updates by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;902](pypa/packaging#902)
- Add spell check and rst check by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;904](pypa/packaging#904)
- Clean up ruff ignores by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;905](pypa/packaging#905)
- Update example for env marker `python_version` by [@&#8203;trim21](https://github.com/trim21) in [#&#8203;908](pypa/packaging#908)
- Move codespell configuration into pyproject.toml by [@&#8203;yarikoptic](https://github.com/yarikoptic) in [#&#8203;910](pypa/packaging#910)
- Check warning a little more precisely by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;837](pypa/packaging#837)
- Speed up mypy a little by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;836](pypa/packaging#836)
- Apply ruff/flake8-pyi rules (PYI) by [@&#8203;DimitriPapadopoulos](https://github.com/DimitriPapadopoulos) in [#&#8203;835](pypa/packaging#835)
- Better local runs for codespell by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;911](pypa/packaging#911)
- Remove outdated/confusing Gist link by [@&#8203;stefan6419846](https://github.com/stefan6419846) in [#&#8203;921](pypa/packaging#921)
- Fix docs and docs ci after [#&#8203;897](pypa/packaging#897) landed by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;926](pypa/packaging#926)
- Run twine-check on push in CI by [@&#8203;EpicWink](https://github.com/EpicWink) in [#&#8203;922](pypa/packaging#922)
- `ruff` was renamed `ruff-check` in pre-commit by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;933](pypa/packaging#933)
- Fix incorrectly implicitly concatenated string in specifiers test by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;946](pypa/packaging#946)
- Simplify conditional by [@&#8203;ofek](https://github.com/ofek) in [#&#8203;949](pypa/packaging#949)
- Modernize nox, use dependency-groups for tests by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;952](pypa/packaging#952)
- Add more checks that don't affect anything by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;957](pypa/packaging#957)
- Enable Ruff ISC rule by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;959](pypa/packaging#959)
- Ruff code FLY by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;963](pypa/packaging#963)
- pytest `log_level` is better than `log_cli_level` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;956](pypa/packaging#956)
- Ruff code TRY by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;961](pypa/packaging#961)
- Add the ruff PL checks by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;964](pypa/packaging#964)
- Enable Ruff ARG rules by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;958](pypa/packaging#958)
- Ruff PT code (pytest) by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;960](pypa/packaging#960)
- Add ruff DTZ by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;968](pypa/packaging#968)
- Add ruff BLE by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;967](pypa/packaging#967)
- Add the ruff SIM checks by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;966](pypa/packaging#966)
- Adding ruff PERF by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;969](pypa/packaging#969)
- Move some config into coverage config by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;971](pypa/packaging#971)
- Check ruff C4 by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;962](pypa/packaging#962)
- Adding ruff T20 by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;972](pypa/packaging#972)
- Add a tests pass job by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;977](pypa/packaging#977)
- Add ruff TC by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;980](pypa/packaging#980)
- Adding part of ruff RET by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;979](pypa/packaging#979)
- Reorder mypy check by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;983](pypa/packaging#983)
- Enable ruff ALL by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;984](pypa/packaging#984)
- Link back to repo/source in furo by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;991](pypa/packaging#991)
- Add case insensitivity tests for arbitrary equality by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;975](pypa/packaging#975)
- Synchronize documentation and code for markers by [@&#8203;zahlman](https://github.com/zahlman) in [#&#8203;1008](pypa/packaging#1008)
- Use `partition` in `_parse_project_urls` by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1013](pypa/packaging#1013)
- auto-skip the dependabot PRs in the release changelog generation by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1016](pypa/packaging#1016)
- Update unreleased section in changelog by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1017](pypa/packaging#1017)
- Fix PR role to match extlinks by [@&#8203;hugovk](https://github.com/hugovk) in [#&#8203;1020](pypa/packaging#1020)
- Mention new parts in README by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1023](pypa/packaging#1023)
- Replace a couple of asserts with else by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1027](pypa/packaging#1027)
- Simplify and/or check a little more by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1031](pypa/packaging#1031)
- Use slim runner for all check by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1021](pypa/packaging#1021)
- Use typos instead of codespell by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1015](pypa/packaging#1015)
- Update changelog with recent additions by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1034](pypa/packaging#1034)
- Publish to PyPI via GitHub CI by [@&#8203;EpicWink](https://github.com/EpicWink) in [#&#8203;893](pypa/packaging#893)
- Use prek for faster pre-commit lint step by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1037](pypa/packaging#1037)
- Add help text to noxfile by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1038](pypa/packaging#1038)
- Update licenses to 3.27 by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1036](pypa/packaging#1036)
- Use relative import in `packaging.licenses` by [@&#8203;notatallshaw](https://github.com/notatallshaw) in [#&#8203;1039](pypa/packaging#1039)
- Add zizmor and tighten up CI by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1035](pypa/packaging#1035)
- Fix release script by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1040](pypa/packaging#1040)
- Fix using a dev version (again) by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1041](pypa/packaging#1041)
- Fix type hint of function used with `contextlib.contextmanager` by [@&#8203;SpecLad](https://github.com/SpecLad) in [#&#8203;1046](pypa/packaging#1046)
- Always run tests by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1044](pypa/packaging#1044)
- Fix a changelog number by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1042](pypa/packaging#1042)
- Fix the publish job by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1043](pypa/packaging#1043)
- Get the correct tag on publish by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1045](pypa/packaging#1045)
- Test on first public release of CPython 3.11 and newer by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1056](pypa/packaging#1056)
- Fix publication job (again) by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1051](pypa/packaging#1051)
- Use `actionlint` to check CI workflows by [@&#8203;miketheman](https://github.com/miketheman) in [#&#8203;1052](pypa/packaging#1052)
- Fix formatting of distribution types in metadata.rst by [@&#8203;brettcannon](https://github.com/brettcannon) in [#&#8203;1053](pypa/packaging#1053)

#### New Contributors

- [@&#8203;cdce8p](https://github.com/cdce8p) made their first contribution in [#&#8203;881](pypa/packaging#881)
- [@&#8203;dholth](https://github.com/dholth) made their first contribution in [#&#8203;860](pypa/packaging#860)
- [@&#8203;trim21](https://github.com/trim21) made their first contribution in [#&#8203;908](pypa/packaging#908)
- [@&#8203;yarikoptic](https://github.com/yarikoptic) made their first contribution in [#&#8203;910](pypa/packaging#910)
- [@&#8203;cthoyt](https://github.com/cthoyt) made their first contribution in [#&#8203;868](pypa/packaging#868)
- [@&#8203;bwoodsend](https://github.com/bwoodsend) made their first contribution in [#&#8203;879](pypa/packaging#879)
- [@&#8203;stefan6419846](https://github.com/stefan6419846) made their first contribution in [#&#8203;921](pypa/packaging#921)
- [@&#8203;bearomorphism](https://github.com/bearomorphism) made their first contribution in [#&#8203;913](pypa/packaging#913)
- [@&#8203;EpicWink](https://github.com/EpicWink) made their first contribution in [#&#8203;922](pypa/packaging#922)
- [@&#8203;Liam-DeVoe](https://github.com/Liam-DeVoe) made their first contribution in [#&#8203;932](pypa/packaging#932)
- [@&#8203;subhajitsaha01](https://github.com/subhajitsaha01) made their first contribution in [#&#8203;930](pypa/packaging#930)
- [@&#8203;ncoghlan](https://github.com/ncoghlan) made their first contribution in [#&#8203;973](pypa/packaging#973)
- [@&#8203;zahlman](https://github.com/zahlman) made their first contribution in [#&#8203;1008](pypa/packaging#1008)
- [@&#8203;JP-Ellis](https://github.com/JP-Ellis) made their first contribution in [#&#8203;939](pypa/packaging#939)

#### Since last RC

Fixes:

- Restore `._version` as a compat shim by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1062](pypa/packaging#1062)

Performance:

- Dual replace by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1064](pypa/packaging#1064)

Documentaiton:

- Prepare for 26.0 final by [@&#8203;henryiii](https://github.com/henryiii) in [#&#8203;1063](pypa/packaging#1063)

**Full Changelog**: <pypa/packaging@26.0rc3...26.0>

</details>

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Reviewed-on: https://kubara.git.onstackit.cloud/STACKIT/kubara/pulls/280
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