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GeezerVison is showing github.com — Add `__orig_bases__` to non-generic TypedDict · Issue #103699 · python/cpython

Add __orig_bases__ to non-generic TypedDict #103699

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Add __orig_bases__ to non-generic TypedDict#103699
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3.12only security fixesonly security fixesstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytopic-typingtype-featureA feature request or enhancementA feature request or enhancement

Description

@adriangb
adriangb
opened on Apr 22, 2023
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Feature or enhancement

As discussed at the typing summit, non generic TypedDict's completely loose all inheritance information. Funny enough, generic TypedDict's actually preserve it via __orig_bases__ because Generic does that. So this just brings non-generic TypedDicts to be the same.

Pitch

This is very useful for runtime type checkers, and as per above the attribute already exists for generic TypedDicts

Previous discussion

Discussed at PyCon 2023 typing summit, this was an uncontroversial yes at the time.

Linked PRs

  • GH-103699: Add __orig_bases__ to various typing classes #103698

Activity

  1. adriangb
    added
    type-featureA feature request or enhancementA feature request or enhancement
    on Apr 22, 2023
  2. AlexWaygood
    added
    stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
    topic-typing
    3.12only security fixesonly security fixes
    on Apr 22, 2023
  3. AlexWaygood
    added a commit that references this issue on Apr 23, 2023

    GH-103699: Add `__orig_bases__` to various typing classes (#103698)

    0056701
  4. AlexWaygood
    closed this as completedon Apr 23, 2023
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