1  import sys
   2  from typing import Any, Generic, Iterable, Iterator, MutableSet, Optional, TypeVar, Union
   3  
   4  if sys.version_info >= (3, 9):
   5      from types import GenericAlias
   6  
   7  _S = TypeVar("_S")
   8  _T = TypeVar("_T")
   9  _SelfT = TypeVar("_SelfT", bound=WeakSet[Any])
  10  
  11  class WeakSet(MutableSet[_T], Generic[_T]):
  12      def __init__(self, data: Optional[Iterable[_T]] = ...) -> None: ...
  13      def add(self, item: _T) -> None: ...
  14      def clear(self) -> None: ...
  15      def discard(self, item: _T) -> None: ...
  16      def copy(self: _SelfT) -> _SelfT: ...
  17      def pop(self) -> _T: ...
  18      def remove(self, item: _T) -> None: ...
  19      def update(self, other: Iterable[_T]) -> None: ...
  20      def __contains__(self, item: object) -> bool: ...
  21      def __len__(self) -> int: ...
  22      def __iter__(self) -> Iterator[_T]: ...
  23      def __ior__(self, other: Iterable[_S]) -> WeakSet[Union[_S, _T]]: ...
  24      def difference(self: _SelfT, other: Iterable[_T]) -> _SelfT: ...
  25      def __sub__(self: _SelfT, other: Iterable[_T]) -> _SelfT: ...
  26      def difference_update(self: _SelfT, other: Iterable[_T]) -> None: ...
  27      def __isub__(self: _SelfT, other: Iterable[_T]) -> _SelfT: ...
  28      def intersection(self: _SelfT, other: Iterable[_T]) -> _SelfT: ...
  29      def __and__(self: _SelfT, other: Iterable[_T]) -> _SelfT: ...
  30      def intersection_update(self, other: Iterable[_T]) -> None: ...
  31      def __iand__(self: _SelfT, other: Iterable[_T]) -> _SelfT: ...
  32      def issubset(self, other: Iterable[_T]) -> bool: ...
  33      def __le__(self, other: Iterable[_T]) -> bool: ...
  34      def __lt__(self, other: Iterable[_T]) -> bool: ...
  35      def issuperset(self, other: Iterable[_T]) -> bool: ...
  36      def __ge__(self, other: Iterable[_T]) -> bool: ...
  37      def __gt__(self, other: Iterable[_T]) -> bool: ...
  38      def __eq__(self, other: object) -> bool: ...
  39      def symmetric_difference(self, other: Iterable[_S]) -> WeakSet[Union[_S, _T]]: ...
  40      def __xor__(self, other: Iterable[_S]) -> WeakSet[Union[_S, _T]]: ...
  41      def symmetric_difference_update(self, other: Iterable[_S]) -> None: ...
  42      def __ixor__(self, other: Iterable[_S]) -> WeakSet[Union[_S, _T]]: ...
  43      def union(self, other: Iterable[_S]) -> WeakSet[Union[_S, _T]]: ...
  44      def __or__(self, other: Iterable[_S]) -> WeakSet[Union[_S, _T]]: ...
  45      def isdisjoint(self, other: Iterable[_T]) -> bool: ...
  46      if sys.version_info >= (3, 9):
  47          def __class_getitem__(cls, item: Any) -> GenericAlias: ...
  48