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Fix set xor return types for abstract sets #16127

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Fix set xor return types for abstract sets #16127

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831c282
Fix set xor return types for abstract sets
subotac Jul 31, 2026
39e1136
Correct set xor signatures for abstract sets
subotac Sep 13, 2026
94a32b3
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Sep 13, 2026
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12 changes: 12 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
@@ -1,3 +1,4 @@
from collections.abc import Set as AbstractSet
from typing_extensions import Literal, assert_type


Expand Down Expand Up @@ -55,3 +56,14 @@ def test_frozenset_interface(s: frozenset[Literal["foo", "bar"]], y: frozenset[s
assert_type(s & y, frozenset[Literal["foo", "bar"]])
assert_type(s | y, frozenset[str])
assert_type(s ^ y, frozenset[str])


def test_xor_with_abstract_set(
s: set[Literal["foo", "bar"]], frozen: frozenset[Literal["foo", "bar"]], other: AbstractSet[str]
) -> None:
s.__xor__(other) # type: ignore
frozen.__xor__(other) # type: ignore
assert_type(other.__rxor__(s), AbstractSet[str])
assert_type(other.__rxor__(frozen), AbstractSet[str])
assert_type(s ^ other, AbstractSet[str])
assert_type(frozen ^ other, AbstractSet[str])
6 changes: 4 additions & 2 deletions stdlib/builtins.pyi
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Expand Up @@ -1460,7 +1460,8 @@ class set(MutableSet[_T]):
def __ior__(self, value: AbstractSet[_T], /) -> Self: ... # type: ignore[override,misc]
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 __xor__(self, value: set[_S] | frozenset[_S], /) -> set[_T | _S]: ... # type: ignore[override]
def __rxor__(self, value: set[_S] | frozenset[_S], /) -> set[_T | _S]: ... # type: ignore[override,misc]
def __ixor__(self, value: AbstractSet[_T], /) -> Self: ... # type: ignore[override,misc]
def __le__(self, value: AbstractSet[object], /) -> bool: ...
def __lt__(self, value: AbstractSet[object], /) -> bool: ...
Expand Down Expand Up @@ -1491,7 +1492,8 @@ class frozenset(AbstractSet[_T_co]):
def __and__(self, value: AbstractSet[object], /) -> frozenset[_T_co]: ...
def __or__(self, value: AbstractSet[_S], /) -> frozenset[_T_co | _S]: ...
def __sub__(self, value: AbstractSet[object], /) -> frozenset[_T_co]: ...
def __xor__(self, value: AbstractSet[_S], /) -> frozenset[_T_co | _S]: ...
def __xor__(self, value: set[_S] | frozenset[_S], /) -> frozenset[_T_co | _S]: ... # type: ignore[override]
def __rxor__(self, value: set[_S] | frozenset[_S], /) -> frozenset[_T_co | _S]: ... # type: ignore[override,misc]
def __le__(self, value: AbstractSet[object], /) -> bool: ...
def __lt__(self, value: AbstractSet[object], /) -> bool: ...
def __ge__(self, value: AbstractSet[object], /) -> bool: ...
Expand Down
1 change: 1 addition & 0 deletions stdlib/typing.pyi
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Expand Up @@ -742,6 +742,7 @@ class AbstractSet(Collection[_T_co]):
def __or__(self, other: AbstractSet[_T], /) -> AbstractSet[_T_co | _T]: ...
def __sub__(self, other: AbstractSet[Any], /) -> AbstractSet[_T_co]: ...
def __xor__(self, other: AbstractSet[_T], /) -> AbstractSet[_T_co | _T]: ...
def __rxor__(self, other: AbstractSet[_T], /) -> AbstractSet[_T_co | _T]: ...
def __eq__(self, other: object, /) -> bool: ...
def isdisjoint(self, other: Iterable[Any], /) -> bool: ...

Expand Down