2 from typing import Any, Callable, ClassVar, Generic, Iterator, Mapping, TypeVar
4 if sys.version_info >= (3, 9):
5 from types import GenericAlias
9 class ContextVar(Generic[_T]):
10 def __init__(self, name: str, *, default: _T = ...) -> None: ...
12 def name(self) -> str: ...
13 def get(self, default: _T = ...) -> _T: ...
14 def set(self, value: _T) -> Token[_T]: ...
15 def reset(self, token: Token[_T]) -> None: ...
16 if sys.version_info >= (3, 9):
17 def __class_getitem__(cls, item: Any) -> GenericAlias: ...
19 class Token(Generic[_T]):
21 def var(self) -> ContextVar[_T]: ...
23 def old_value(self) -> Any: ... # returns either _T or MISSING, but that's hard to express
24 MISSING: ClassVar[object]
25 if sys.version_info >= (3, 9):
26 def __class_getitem__(cls, item: Any) -> GenericAlias: ...
28 def copy_context() -> Context: ...
30 # It doesn't make sense to make this generic, because for most Contexts each ContextVar will have
32 class Context(Mapping[ContextVar[Any], Any]):
33 def __init__(self) -> None: ...
34 def run(self, callable: Callable[..., _T], *args: Any, **kwargs: Any) -> _T: ...
35 def copy(self) -> Context: ...
36 def __getitem__(self, key: ContextVar[Any]) -> Any: ...
37 def __iter__(self) -> Iterator[ContextVar[Any]]: ...
38 def __len__(self) -> int: ...