code: def start(self):
          
          with self._lock:
              if self.is_alive:
                  return
  
              self._thread = threading.Thread(
                  target=self._thread_main, name=_WORKER_THREAD_NAME)
              self._thread.daemon = True
              self._thread.start()
              atexit.register(self._export_pending_data)
docs: Starts the background thread.
  
          Additionally, this registers a handler for process exit to attempt
          to send any pending data before shutdown.