8000 Convert AbstractContextManager from a protocol to an ABC by NeilGirdhar · Pull Request #11269 · python/typeshed · GitHub
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Convert AbstractContextManager from a protocol to an ABC #11269

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Convert AbstractContextManager from a protocol to an ABC #11269

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12 changes: 7 additions & 5 deletions stdlib/contextlib.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ from _typeshed import FileDescriptorOrPath, Unused
from abc import abstractmethod
from collections.abc import AsyncGenerator, AsyncIterator, Awaitable, Callable, Generator, Iterator
from types import TracebackType
from typing import IO, Any, Generic, Protocol, TypeVar, overload, runtime_checkable
from typing import IO, Any, Generic, Protocol, TypeVar, overload
from typing_extensions import ParamSpec, Self, TypeAlias

__all__ = [
Expand Down Expand Up @@ -37,16 +37,18 @@ _P = ParamSpec("_P")
_ExitFunc: TypeAlias = Callable[[type[BaseException] | None, BaseException | None, TracebackType | None], bool | None]
_CM_EF = TypeVar("_CM_EF", bound=AbstractContextManager[Any] | _ExitFunc)

@runtime_checkable
class AbstractContextManager(Protocol[_T_co]):
# AbstractContextManager should not be a protocol or else the exit method, which is abstract, cannot be determined by type checkers to
# be implemented. This prevents users from calling super. For details, see this comment:
# https://github.com/microsoft/pyright/issues/6965#issuecomment-1889704569
class AbstractContextManager(Generic[_T_co], metaclass=abc.ABCMeta):
def __enter__(self) -> _T_co: ...
@abstractmethod
def __exit__(
self, __exc_type: type[BaseException] | None, __exc_value: BaseException | None, __traceback: TracebackType | None
) -> bool | None: ...

@runtime_checkable
class AbstractAsyncContextManager(Protocol[_T_co]):
# As with AbstractContextManager, this should not be a protocol.
class AbstractAsyncContextManager(Generic[_T_co], metaclass=abc.ABCMeta):
async def __aenter__(self) -> _T_co: ...
@abstractmethod
async def __aexit__(
Expand Down
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