diff --git a/stdlib/3.7/contextvars.pyi b/stdlib/3.7/contextvars.pyi new file mode 100644 index 000000000..b5c8082aa --- /dev/null +++ b/stdlib/3.7/contextvars.pyi @@ -0,0 +1,27 @@ +from typing import Any, Callable, ClassVar, Generic, Mapping, TypeVar, Union + +_T = TypeVar('_T') + +class ContextVar(Generic[_T]): + def __init__(self, name: str, *, default: _T = ...) -> None: ... + @property + def name(self) -> str: ... + def get(self, default: _T = ...) -> _T: ... + def set(self, value: _T) -> Token[_T]: ... + def reset(self, token: Token[_T]) -> None: ... + +class Token(Generic[_T]): + @property + def var(self) -> ContextVar[_T]: ... + @property + def old_value(self) -> Any: ... # returns either _T or MISSING, but that's hard to express + MISSING: ClassVar[object] + +def copy_context() -> Context: ... + +# It doesn't make sense to make this generic, because for most Contexts each ContextVar will have +# a different value. +class Context(Mapping[ContextVar[Any], Any]): + def __init__(self) -> None: ... + def run(self, callable: Callable[..., _T], *args: Any, **kwargs: Any) -> _T: ... + def copy(self) -> Context: ...