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Allow .update(**kwargs) on Mappings with keys that overlap with str #14420

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Allow .update(**kwargs) on Mappings with keys that overlap with str #14420

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8 changes: 8 additions & 0 deletions stdlib/@tests/test_cases/typing/check_MutableMapping.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,12 +8,12 @@
d: dict[int, int] = {}
d.update({1: 2})
d.update([(1, 2)])
d.update(a=3) # type: ignore

Check failure on line 11 in stdlib/@tests/test_cases/typing/check_MutableMapping.py

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Unnecessary "# type: ignore" comment (reportUnnecessaryTypeIgnoreComment)
d.update({1: 2}, a=3) # type: ignore
d.update([(1, 2)], a=3) # type: ignore
d.update({"": 3}) # type: ignore

Check failure on line 14 in stdlib/@tests/test_cases/typing/check_MutableMapping.py

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Unnecessary "# type: ignore" comment (reportUnnecessaryTypeIgnoreComment)
d.update({1: ""}) # type: ignore
d.update([("", 3)]) # type: ignore

Check failure on line 16 in stdlib/@tests/test_cases/typing/check_MutableMapping.py

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Unnecessary "# type: ignore" comment (reportUnnecessaryTypeIgnoreComment)
d.update([(3, "")]) # type: ignore


Expand All @@ -30,6 +30,14 @@
d.update([("", "")]) # type: ignore


def check_update_kwarg_key_type_accepts_str() -> None:
d1: dict[str | int, int] = {}
d1.update(a=1)

d2: dict[object, int] = {}
d2.update(a=1)


def check_setdefault_method() -> None:
d: dict[int, str] = {}
d2: dict[int, str | None] = {}
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6 changes: 3 additions & 3 deletions stdlib/typing.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -800,13 +800,13 @@ class MutableMapping(Mapping[_KT, _VT]):
@overload
def update(self, m: SupportsKeysAndGetItem[_KT, _VT], /) -> None: ...
@overload
def update(self: Mapping[str, _VT], m: SupportsKeysAndGetItem[str, _VT], /, **kwargs: _VT) -> None: ...
def update(self: Mapping[str | Any, _VT], m: SupportsKeysAndGetItem[str, _VT], /, **kwargs: _VT) -> None: ...
@overload
def update(self, m: Iterable[tuple[_KT, _VT]], /) -> None: ...
@overload
def update(self: Mapping[str, _VT], m: Iterable[tuple[str, _VT]], /, **kwargs: _VT) -> None: ...
def update(self: Mapping[str | Any, _VT], m: Iterable[tuple[str, _VT]], /, **kwargs: _VT) -> None: ...
@overload
def update(self: Mapping[str, _VT], **kwargs: _VT) -> None: ...
def update(self: Mapping[str | Any, _VT], **kwargs: _VT) -> None: ...

Text = str

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