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PYTHON-5917 Fix document_class generic alias check on PyPy - #2917
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issubclass() does not raise TypeError for generic aliases like dict[str, Any] or SON[str, Any] on all Python implementations (e.g. PyPy), so the exception-based fallback to check __origin__ never ran, causing a spurious TypeError. Resolve __origin__ before the subclass check instead of relying on catching the error.
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blink1073
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July 7, 2026 14:00
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PYTHON-5917
Changes in this PR
Fixes a PyPy-only failure when validating a parameterized generic
document_class(e.g.dict[str, Any],SON[str, Any]).Passing build: https://spruce.corp.mongodb.com/version/6a4bd47a30181800078c2ed7/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC
Test Plan
Covered by existing unit tests exercising generic
document_classvalues; verified passing on PyPy via the Evergreen patch linked above.Checklist
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