docs: def start_data_fetch(self):
          """Starts a thread that fetches data from the Streams view server.
  
          Each item in the returned `Queue` represents a single tuple
          on the stream the view is attached to.
          
          Returns:
              queue.Queue: Queue containing view data.
  
          .. note:: This is a queue of the tuples coverted to Python
              objects, it is not a queue of :py:class:`ViewItem` objects.
          """
          self.stop_data_fetch()
          self._data_fetcher = _ViewDataFetcher(self, self._tuple_fn)
          t = threading.Thread(target=self._data_fetcher)
          t.start()
          return self._data_fetcher.items