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canonicalized set/frozenset signatures by randolf-scholz · Pull Request #15470 · python/typeshed · GitHub

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canonicalized set/frozenset signatures #15470

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Merged
srittau merged 1 commit into from
Mar 2, 2026
Conversation 2 Commits 1 Checks 50 Files changed
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canonicalized set/frozenset signatures #15470

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43 changes: 43 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
Expand Up @@ -12,3 +12,46 @@ def test_set_difference(x: set[Literal["foo", "bar"]], y: set[str], z: set[int])
assert_type(z - x, set[int])
assert_type(y - z, set[str])
assert_type(z - y, set[int])


def test_set_interface_overlapping_type(s: set[Literal["foo", "bar"]], y: set[str], key: str) -> None:
s.add(key) # type: ignore
s.discard(key)
s.remove(key) # type: ignore
s.difference_update(y)
s.intersection_update(y)
s.symmetric_difference_update(y) # type: ignore
s.update(y) # type: ignore

assert_type(s.difference(y), set[Literal["foo", "bar"]])
assert_type(s.intersection(y), set[Literal["foo", "bar"]])
assert_type(s.isdisjoint(y), bool)
assert_type(s.issubset(y), bool)
assert_type(s.issuperset(y), bool)
assert_type(s.symmetric_difference(y), set[str])
assert_type(s.union(y), set[str])

assert_type(s - y, set[Literal["foo", "bar"]])
assert_type(s & y, set[Literal["foo", "bar"]])
assert_type(s | y, set[str])
assert_type(s ^ y, set[str])

s -= y
s &= y
s |= y # type: ignore
s ^= y # type: ignore


def test_frozenset_interface(s: frozenset[Literal["foo", "bar"]], y: frozenset[str]) -> None:
assert_type(s.difference(y), frozenset[Literal["foo", "bar"]])
assert_type(s.intersection(y), frozenset[Literal["foo", "bar"]])
assert_type(s.isdisjoint(y), bool)
assert_type(s.issubset(y), bool)
assert_type(s.issuperset(y), bool)
assert_type(s.symmetric_difference(y), frozenset[str])
assert_type(s.union(y), frozenset[str])

assert_type(s - y, frozenset[Literal["foo", "bar"]])
assert_type(s & y, frozenset[Literal["foo", "bar"]])
assert_type(s | y, frozenset[str])
assert_type(s ^ y, frozenset[str])
24 changes: 12 additions & 12 deletions stdlib/builtins.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -1262,16 +1262,16 @@ class set(MutableSet[_T]):
def __init__(self, iterable: Iterable[_T], /) -> None: ...
def add(self, element: _T, /) -> None: ...
def copy(self) -> set[_T]: ...
def difference(self, *s: Iterable[Any]) -> set[_T]: ...
def difference_update(self, *s: Iterable[Any]) -> None: ...
def discard(self, element: _T, /) -> None: ...
def intersection(self, *s: Iterable[Any]) -> set[_T]: ...
def intersection_update(self, *s: Iterable[Any]) -> None: ...
def isdisjoint(self, s: Iterable[Any], /) -> bool: ...
def issubset(self, s: Iterable[Any], /) -> bool: ...
def issuperset(self, s: Iterable[Any], /) -> bool: ...
def difference(self, *s: Iterable[object]) -> set[_T]: ...
def difference_update(self, *s: Iterable[object]) -> None: ...
def discard(self, element: object, /) -> None: ...
def intersection(self, *s: Iterable[object]) -> set[_T]: ...
def intersection_update(self, *s: Iterable[object]) -> None: ...
def isdisjoint(self, s: Iterable[object], /) -> bool: ...
def issubset(self, s: Iterable[object], /) -> bool: ...
def issuperset(self, s: Iterable[object], /) -> bool: ...
def remove(self, element: _T, /) -> None: ...
def symmetric_difference(self, s: Iterable[_T], /) -> set[_T]: ...
def symmetric_difference(self, s: Iterable[_S], /) -> set[_T | _S]: ...
def symmetric_difference_update(self, s: Iterable[_T], /) -> None: ...
def union(self, *s: Iterable[_S]) -> set[_T | _S]: ...
def update(self, *s: Iterable[_T]) -> None: ...
Expand Down Expand Up @@ -1303,15 +1303,15 @@ class frozenset(AbstractSet[_T_co]):
def copy(self) -> frozenset[_T_co]: ...
def difference(self, *s: Iterable[object]) -> frozenset[_T_co]: ...
def intersection(self, *s: Iterable[object]) -> frozenset[_T_co]: ...
def isdisjoint(self, s: Iterable[_T_co], /) -> bool: ...
def isdisjoint(self, s: Iterable[object], /) -> bool: ...
def issubset(self, s: Iterable[object], /) -> bool: ...
def issuperset(self, s: Iterable[object], /) -> bool: ...
def symmetric_difference(self, s: Iterable[_T_co], /) -> frozenset[_T_co]: ...
def symmetric_difference(self, s: Iterable[_S], /) -> frozenset[_T_co | _S]: ...
def union(self, *s: Iterable[_S]) -> frozenset[_T_co | _S]: ...
def __len__(self) -> int: ...
def __contains__(self, o: object, /) -> bool: ...
def __iter__(self) -> Iterator[_T_co]: ...
def __and__(self, value: AbstractSet[_T_co], /) -> frozenset[_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]: ...
Expand Down
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