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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 _inform_watchdog(self):
 """Inform the watchdog of activity."""

        async with self._wd_lock:
            if self._watchdog_task is None:
                # Check within the Lock to deal with external cancel_watchdog
                # calls with queued _inform_watchdog tasks.
                return
            self._watchdog_task.cancel()
            try:
                await self._watchdog_task
            except asyncio.CancelledError:
                self._watchdog_task = self.loop.create_task(self._watchdog(
                    self._watchdog_timeout))