code: def sync_streams(self):
          
          if self._sync_streams is None:
              self._sync_streams = SyncStreamList(self._version, service_sid=self._solution['sid'], )
          return self._sync_streams
docs: Access the sync_streams
  
          :returns: twilio.rest.sync.v1.service.sync_stream.SyncStreamList
          :rtype: twilio.rest.sync.v1.service.sync_stream.SyncStreamList