code: def modify_order(self, modify_order_op, order_id, qty, price, adjust_limit=0, trd_env=TrdEnv.REAL, acc_id=0, acc_index=0):
          
          return super(OpenHKCCTradeContext, self).modify_order(modify_order_op=modify_order_op,
                                      order_id=order_id,
                                      qty=qty,
                                      price=price,
                                      adjust_limit=adjust_limit,
                                      trd_env=trd_env,
                                      acc_id=acc_id,
                                      acc_index=acc_index)
docs: 详细说明见基类接口说明，但有以下不同：不支持改单。 可撤单。删除订单是本地操作。
          :param modify_order_op:
          :param order_id:
          :param qty:
          :param price:
          :param adjust_limit:
          :param trd_env:
          :param acc_id:
          :return: