code: def _init_threads(self):
          
          if self._io_thread is None:
              self._io_thread = Thread(target=self._select)
              self._io_thread.start()
  
          if self._writer_thread is None:
              self._writer_thread = Thread(target=self._writer)
              self._writer_thread.start()
docs: Initializes the IO and Writer threads