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from abc import ABCMeta, abstractmethod from types import TracebackType from typing import Optional, Type, TypeVar T = TypeVar("T") class AsyncResource(metaclass=ABCMeta): """ Abstract base class for all closeable asynchronous resources. Works as an asynchronous context manager which returns the instance itself on enter, and calls :meth:`aclose` on exit. """ async def __aenter__(self: T) -> T: return self async def __aexit__( self, exc_type: Optional[Type[BaseException]], exc_val: Optional[BaseException], exc_tb: Optional[TracebackType], ) -> None: await self.aclose() @abstractmethod async def aclose(self) -> None: """Close the resource."""