code: def trade_worker(
          self, users, expire_seconds=120, entrust_prop="limit", send_interval=0
      ):
          
          while True:
              trade_cmd = self.trade_queue.get()
              self._execute_trade_cmd(
                  trade_cmd, users, expire_seconds, entrust_prop, send_interval
              )
              time.sleep(send_interval)
docs: :param send_interval: 交易发送间隔， 默认为0s。调大可防止卖出买入时买出单没有及时成交导致的买入金额不足