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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 async def stop(self, _task=None):
 """Stop the device adapter. See :meth:`AbstractDeviceAdapter.stop`. """


        self._logger.info("Stopping adapter wrapper")

        if self._task.stopped:
            return

        for task in self._task.subtasks:
            await task.stop()

        self._logger.debug("Stopping underlying adapter %s", self._adapter.__class__.__name__)
        await self._execute(self._adapter.stop_sync)