code: def send_order(self,  code, price, amount, towards, order_model, market=None):
          
  
          towards = 0 if towards == ORDER_DIRECTION.BUY else 1
          if order_model == ORDER_MODEL.MARKET:
              order_model = 4
          elif order_model == ORDER_MODEL.LIMIT:
              order_model = 0
  
          if market is None:
              market = QAFetch.base.get_stock_market(code)
          if not isinstance(market, str):
              raise Exception('%s不正确，请检查code和market参数' % market)
          market = market.lower()
          if market not in ['sh', 'sz']:
              raise Exception('%s不支持，请检查code和market参数' % market)
  
          return self.data_to_df(self.call("send_order", {
              'client_id': self.client_id,
              'category': towards,
              'price_type': order_model,
              'gddm': self.gddm_sh if market == 'sh' else self.gddm_sz,
              'zqdm': code,
              'price': price,
              'quantity': amount
          }))
docs: 下单
  
          Arguments:
              code {[type]} -- [description]
              price {[type]} -- [description]
              amount {[type]} -- [description]
              towards {[type]} -- [description]
              order_model {[type]} -- [description]
              market:市场，SZ 深交所，SH 上交所
  
          Returns:
              [type] -- [description]