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31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
from typing import Any, Callable, ClassVar, Generic, Iterator, Mapping, TypeVar
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_T = TypeVar('_T')
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class ContextVar(Generic[_T]):
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def __init__(self, name: str, *, default: _T = ...) -> None: ...
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@property
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def name(self) -> str: ...
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def get(self, default: _T = ...) -> _T: ...
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def set(self, value: _T) -> Token[_T]: ...
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def reset(self, token: Token[_T]) -> None: ...
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class Token(Generic[_T]):
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@property
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def var(self) -> ContextVar[_T]: ...
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@property
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def old_value(self) -> Any: ... # returns either _T or MISSING, but that's hard to express
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MISSING: ClassVar[object]
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def copy_context() -> Context: ...
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# It doesn't make sense to make this generic, because for most Contexts each ContextVar will have
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# a different value.
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class Context(Mapping[ContextVar[Any], Any]):
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def __init__(self) -> None: ...
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def run(self, callable: Callable[..., _T], *args: Any, **kwargs: Any) -> _T: ...
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def copy(self) -> Context: ...
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def __getitem__(self, key: ContextVar[Any]) -> Any: ...
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def __iter__(self) -> Iterator[ContextVar[Any]]: ...
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def __len__(self) -> int: ...
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