_file_io.py 文件源码

def aclose(self):
        """Like :meth:`io.IOBase.close`, but async.

        This is also shielded from cancellation; if a cancellation scope is
        cancelled, the wrapped file object will still be safely closed.

        """

        # ensure the underling file is closed during cancellation
        with _core.open_cancel_scope(shield=True):
            await trio.run_sync_in_worker_thread(self._wrapped.close)

        await _core.checkpoint_if_cancelled()