Avoid eagerly evaluating annotations #132493

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1. JelleZijlstra

   added

   3.14bugs and security fixesbugs and security fixes

   on Apr 14, 2025
2. JelleZijlstra

   added a commit that references this issue on Apr 14, 2025

   pythongh-132493: Support deferred annotations in Protocols

   758fdb0
3. JelleZijlstra commented on Apr 14, 2025

   

   JelleZijlstra

   on Apr 14, 2025

   MemberAuthor

   More actions

   Other cases from a quick audit:

   • typing._proto_hook eagerly evaluates annotations. Looks like this could trigger on code like isinstance(X, SomeProtocol) where X has deferred annotations. It doesn't need to know the value of the annotations, only what keys exist.
   • inspect._signature_is_functionlike looks for the presence of annotations to decide that something is functionlike. Maybe it should look for __annotate__ instead?
   • pydoc in two places looks for the presence of annotations for something with lambdas that I haven't fully deciphered
   • reprlib.recursive_repr creates a wrapper function that inherits __annotations__. It should probably use __annotate__ instead.
4. picnixz

   added

   type-featureA feature request or enhancementA feature request or enhancement

   performancePerformance or resource usagePerformance or resource usage

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   and removed

   type-featureA feature request or enhancementA feature request or enhancement

   on Apr 14, 2025
5. JelleZijlstra

   removed

   performancePerformance or resource usagePerformance or resource usage

   on Apr 14, 2025
6. felixscherz

   added 2 commits that reference this issue on Apr 14, 2025

   pythongh-132493: enable protocol isinstance checks against classes wi…

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   5e91b7d

   pythongh-132493: enable protocol isinstance checks against classes wi…

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   34c6039
7. JelleZijlstra

   added 4 commits that reference this issue on Apr 15, 2025

   gh-132493: Support deferred annotations in Protocols (#132494)

   666eeda

   pythongh-132493: Lazily determine protocol attributes

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   1a970b3

   gh-132493: lazy evaluation of annotations in `typing._proto_hook` (#1…

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   71af090

   gh-132493: Avoid eager import of annotationlib in typing (again) (#13…

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   5707837
8. JelleZijlstra

   added 4 commits that reference this issue on May 4, 2025

   pythongh-132493: Avoid eager evaluation of annotations in `@reprlib.r…

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   dd208ed

   pythongh-132493: Remove __annotations__ usage in inspect._signature_i…

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   22dbf9f

   gh-132493: Avoid eager evaluation of annotations in `@reprlib.recursi…

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   dbee142

   gh-132493: Remove __annotations__ usage in inspect._signature_is_func…

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   cb6596c
9. miss-islington

   added a commit that references this issue on May 10, 2025

   pythongh-132493: Remove __annotations__ usage in inspect._signature_i…

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   775435e
10. JelleZijlstra

    added a commit that references this issue on May 26, 2025

    [3.14] gh-132493: Remove __annotations__ usage in inspect._signature_…

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    dc441ef
11. Pranjal095

    added 2 commits that reference this issue on Jul 12, 2025

    pythongh-132493: Avoid eager evaluation of annotations in `@reprlib.r…

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    7875a27

    pythongh-132493: Remove __annotations__ usage in inspect._signature_i…

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    29a631c
12. taegyunkim

    added a commit that references this issue on Aug 4, 2025

    pythongh-132493: Remove __annotations__ usage in inspect._signature_i…

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    3ed2d4c