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allow arbitrary types in set difference #15160

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allow arbitrary types in set difference #15160

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7 changes: 7 additions & 0 deletions stdlib/@tests/test_cases/builtins/check_set.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
from typing_extensions import assert_type

# Note: type checkers / linters are free to point out that the set difference
# below is redundant. But typeshed should allow it, as its job is to describe
# what is legal in Python, not what is sensible.
x: set[str] = {"foo", "bar"}
assert_type(x - {123}, set[str])
4 changes: 2 additions & 2 deletions stdlib/builtins.pyi
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Expand Up @@ -1282,7 +1282,7 @@ class set(MutableSet[_T]):
def __iand__(self, value: AbstractSet[object], /) -> Self: ...
def __or__(self, value: AbstractSet[_S], /) -> set[_T | _S]: ...
def __ior__(self, value: AbstractSet[_T], /) -> Self: ... # type: ignore[override,misc]
def __sub__(self, value: AbstractSet[_T | None], /) -> set[_T]: ...
def __sub__(self, value: AbstractSet[object], /) -> set[_T]: ...
def __isub__(self, value: AbstractSet[object], /) -> Self: ...
def __xor__(self, value: AbstractSet[_S], /) -> set[_T | _S]: ...
def __ixor__(self, value: AbstractSet[_T], /) -> Self: ... # type: ignore[override,misc]
Expand Down Expand Up @@ -1313,7 +1313,7 @@ class frozenset(AbstractSet[_T_co]):
def __iter__(self) -> Iterator[_T_co]: ...
def __and__(self, value: AbstractSet[_T_co], /) -> frozenset[_T_co]: ...
def __or__(self, value: AbstractSet[_S], /) -> frozenset[_T_co | _S]: ...
def __sub__(self, value: AbstractSet[_T_co], /) -> frozenset[_T_co]: ...
def __sub__(self, value: AbstractSet[object], /) -> frozenset[_T_co]: ...
def __xor__(self, value: AbstractSet[_S], /) -> frozenset[_T_co | _S]: ...
def __le__(self, value: AbstractSet[object], /) -> bool: ...
def __lt__(self, value: AbstractSet[object], /) -> bool: ...
Expand Down