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Sync typeshed#20415
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Source commit:python/typeshed@2f3c3b7
This is allegedly causing large performance problems, see 13821typeshed/8231 had zero hits on mypy_primer, so it's not the worst thingto undo. Patching this in typeshed also feels weird, since there's amore general soundness issue. If a typevar has a bound or constraint, wemight not want to solve it to a Literal.If we can confirm the performance regression or fix the unsoundnesswithin mypy, I might pursue upstreaming this in typeshed.(Reminder: add this to the sync_typeshed script once merged)
… checking:#13987 (comment) A manual cherry-pick ofe437cdf.
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hauntsaninja commentedDec 15, 2025
Primer ispython/typeshed#15085 |
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Diff frommypy_primer, showing the effect of this PR on open source code: starlette (https://github.com/encode/starlette)+ tests/test_datastructures.py:171: error: No overload variant of "get" of "Mapping" matches argument types "str", "None" [call-overload]+ tests/test_datastructures.py:171: note: Possible overload variants:+ tests/test_datastructures.py:171: note: def get(self, str, /) -> str | None+ tests/test_datastructures.py:171: note: def get(self, str, str, /) -> str+ tests/test_datastructures.py:171: note: def [_T] get(self, str, _T, /) -> str | _T+ tests/test_datastructures.py:287: error: No overload variant of "get" of "Mapping" matches argument types "str", "None" [call-overload]+ tests/test_datastructures.py:287: note: Possible overload variants:+ tests/test_datastructures.py:287: note: def get(self, str, /) -> str | None+ tests/test_datastructures.py:287: note: def get(self, str, str, /) -> str+ tests/test_datastructures.py:287: note: def [_T] get(self, str, _T, /) -> str | _T+ tests/test_datastructures.py:371: error: No overload variant of "get" of "Mapping" matches argument types "str", "None" [call-overload]+ tests/test_datastructures.py:371: note: Possible overload variants:+ tests/test_datastructures.py:371: note: def get(self, str, /) -> UploadFile | str | None+ tests/test_datastructures.py:371: note: def get(self, str, UploadFile | str, /) -> UploadFile | str+ tests/test_datastructures.py:371: note: def [_T] get(self, str, _T, /) -> UploadFile | str | _T+ tests/test_datastructures.py:406: error: No overload variant of "get" of "Mapping" matches argument types "str", "None" [call-overload]+ tests/test_datastructures.py:406: note: Possible overload variants:+ tests/test_datastructures.py:406: note: def get(self, Any, /) -> Any | None+ tests/test_datastructures.py:406: note: def get(self, Any, Any, /) -> Any+ tests/test_datastructures.py:406: note: def [_T] get(self, Any, _T, /) -> Any | _Tscrapy (https://github.com/scrapy/scrapy)+ scrapy/cmdline.py:29: error: Return type "tuple[Action | None, str, str | None] | None" of "_parse_optional" incompatible with return type "list[tuple[Action | None, str, str | None, str | None]] | None" in supertype "argparse.ArgumentParser" [override]+ scrapy/cmdline.py:37: error: Incompatible return value type (got "list[tuple[Action | None, str, str | None, str | None]] | None", expected "tuple[Action | None, str, str | None] | None") [return-value]operator (https://github.com/canonical/operator)- ops/model.py:1016: note: def get(self, str, /, default: Binding) -> Binding+ ops/model.py:1016: note: def get(self, str, Binding, /) -> Binding- ops/model.py:1016: note: def [_T] get(self, str, /, default: _T) -> Binding | _T+ ops/model.py:1016: note: def [_T] get(self, str, _T, /) -> Binding | _Tsteam.py (https://github.com/Gobot1234/steam.py)- steam/ext/commands/utils.py:43: note: def get(self, str, /, default: _VT) -> _VT+ steam/ext/commands/utils.py:43: note: def get(self, str, _VT, /) -> _VT- steam/ext/commands/utils.py:43: note: def [_T] get(self, str, /, default: _T) -> _VT | _T+ steam/ext/commands/utils.py:43: note: def [_T] get(self, str, _T, /) -> _VT | _T- steam/ext/commands/utils.py:52: note: def pop(self, str, /, default: _VT) -> _VT+ steam/ext/commands/utils.py:52: note: def pop(self, str, _VT, /) -> _VT- steam/ext/commands/utils.py:52: note: def [_T] pop(self, str, /, default: _T) -> _VT | _T+ steam/ext/commands/utils.py:52: note: def [_T] pop(self, str, _T, /) -> _VT | _Tdiscord.py (https://github.com/Rapptz/discord.py)- ...venv/lib/python3.14/site-packages/mypy/typeshed/stdlib/typing.pyi:1041: note: "update" of "TypedDict" defined here+ ...venv/lib/python3.14/site-packages/mypy/typeshed/stdlib/typing.pyi:1046: note: "update" of "TypedDict" defined herepyodide (https://github.com/pyodide/pyodide)- pyodide-build/pyodide_build/xbuildenv_releases.py:220: note: def get(self, str, /, default: str) -> str+ pyodide-build/pyodide_build/xbuildenv_releases.py:220: note: def get(self, str, str, /) -> str- pyodide-build/pyodide_build/xbuildenv_releases.py:220: note: def [_T] get(self, str, /, default: _T) -> str | _T+ pyodide-build/pyodide_build/xbuildenv_releases.py:220: note: def [_T] get(self, str, _T, /) -> str | _T |
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python/typeshed@2f3c3b7
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