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allow arbitrary types in set difference (#15160)

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Randolf Scholz
2026-01-16 14:36:23 +01:00
committed by GitHub
parent bcf2ccf0a3
commit 236a8c0b08
2 changed files with 16 additions and 2 deletions
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stdlib/@tests/test_cases/builtins/check_set.py
+14
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@@ -0,0 +1,14 @@
from typing_extensions import Literal, 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.
# For instance, set[Literal] - set[str] should be legal.
def test_set_difference(x: set[Literal["foo", "bar"]], y: set[str], z: set[int]) -> None:
assert_type(x - y, set[Literal["foo", "bar"]])
assert_type(y - x, set[str])
assert_type(x - z, set[Literal["foo", "bar"]])
assert_type(z - x, set[int])
assert_type(y - z, set[str])
assert_type(z - y, set[int])
stdlib/builtins.pyi
+2 -2
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@@ -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]
@@ -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: ...