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gh-139140: Document that reading __annotations__ via __dict__ is unre… - #151750
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JelleZijlstra merged 1 commit intoNov 1, 2026
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…s unreliable on Python 3.14+
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This PR is stale because it has been open for 90 days with no activity. |
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Could someone review this docs change? It limits the |
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Thanks @Builder106 for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14. |
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Thanks @Builder106 for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.15. |
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GH-161050 is a backport of this pull request to the 3.14 branch. |
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GH-161051 is a backport of this pull request to the 3.15 branch. |
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The "Annotations Best Practices" HOWTO recommended reading a class's annotations via
cls.__dict__.get('__annotations__', None)as a general fallback for "earlier versions of Python." Under PEP 649/749 (Python 3.14), annotations are evaluated lazily, and how they're stored in the class__dict__is a private implementation detail, so that pattern is no longer reliable on 3.14+.This re-scopes the
__dict__workaround to Python 3.9 and earlier (where neitherinspect.get_annotationsnorannotationlib.get_annotationsis available), and adds a note directing 3.14+ readers toannotationlib.get_annotations/inspect.get_annotationsinstead.Docs-only change; no
Misc/NEWS.dentry needed.Fixes #139140
__annotations__through__dict__no longer works #139140