code: def _set_market_trade_type(self, ttype):
          
          selects = self._main.child_window(
              control_id=self._config.TRADE_MARKET_TYPE_CONTROL_ID,
              class_name="ComboBox",
          )
          for i, text in selects.texts():
              # skip 0 index, because 0 index is current select index
              if i == 0:
                  continue
              if ttype in text:
                  selects.select(i - 1)
                  break
          else:
              raise TypeError("不支持对应的市价类型: {}".format(ttype))
docs: 根据选择的市价交易类型选择对应的下拉选项