code: def update(self, space_no, key_tuple, op_list):
          
          d = self.replyQueue.get()
          packet = RequestUpdate(self.charset, self.errors, d._ipro_request_id, space_no, 0, key_tuple, op_list)
          self.transport.write(bytes(packet))
          return d.addCallback(self.handle_reply, self.charset, self.errors, None)
docs: send update command(s)