code: def ReqOrderAction(self, OrderID: str):
          
          of = self.orders[OrderID]
  
          if not of:
              return -1
          else:
              pOrderId = of.OrderID
              return self.t.ReqOrderAction(
                  self.broker,
                  self.investor,
                  OrderRef=pOrderId.split('|')[2],
                  FrontID=int(pOrderId.split('|')[1]),
                  SessionID=int(pOrderId.split('|')[0]),
                  InstrumentID=of.InstrumentID,
                  ActionFlag=TThostFtdcActionFlagType.THOST_FTDC_AF_Delete)
docs: 撤单
  
          :param OrderID: