gh-145521: Add 'infer_variance' parameter to ParamSpec class

[hyperkai]

Fix: #145521

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📚 Documentation preview 📚: https://cpython-previews--145522.org.readthedocs.build/

• Issue: The docs should also say infer_variance parameter with typing.ParamSpec explanation #145521

[inventshah]

Should we add some text about the version this changed (e.g. 3.12)?

[AlexWaygood]

Should we add some text about the version this changed (e.g. 3.12)?

We can do. But we shouldn't devote too much space to this, because ParamSpecs are always invariant. It's a bit confusing that they have this parameter; type checkers will just ignore it.

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #32518599 | 📁 Comparing eb0b7ab against main (4144062)

  🔍 Preview build  

1 file changed

± library/typing.html

[miss-islington-app]

Thanks @hyperkai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @hyperkai and @JelleZijlstra, I could not cleanly backport this to 3.14 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 2e94f14310e8ab62f41dd01276f2c69cb3d36da2 3.14

[miss-islington-app]

Sorry, @hyperkai and @JelleZijlstra, I could not cleanly backport this to 3.13 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 2e94f14310e8ab62f41dd01276f2c69cb3d36da2 3.13