covariant warnings.catch_warnings type-parameter with default#13675
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srittau merged 2 commits intopython:mainfrom Mar 20, 2025
Merged
covariant warnings.catch_warnings type-parameter with default#13675srittau merged 2 commits intopython:mainfrom
warnings.catch_warnings type-parameter with default#13675srittau merged 2 commits intopython:mainfrom
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Diff from mypy_primer, showing the effect of this PR on open source code: pytest (https://github.com/pytest-dev/pytest)
+ src/_pytest/recwarn.py:170: error: Unused "type: ignore" comment [unused-ignore]
+ src/_pytest/recwarn.py:229: error: Return type "WarningsRecorder" of "__enter__" incompatible with return type "Optional[list[WarningMessage]]" in supertype "catch_warnings" [override]
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This changes the type parameter of
warnings.catch_warningsin two ways:covariant=True— as it's only used within output positions — and renamed it accordinglydefaultto its upperboundso that it isn't required anymore to pass a type-argument to a class that is not subscriptable at runtimeThe invariance was causing issues within the numpy stubs for a generic a subclass:
https://github.com/numpy/numpy/blob/0aafd8553a986c7d39dde489ac5d42e53322b090/numpy/testing/_private/utils.pyi#L138-L147 to be precise