code: def instrument(self, start=0, offset=100):
          '''
          查询代码列表
          :param start:
          :param offset:
          :return: pd.dataFrame or None
          '''
          with self.client.connect(*self.bestip):
              # nums = self.client.get_instrument_count()
              data = self.client.get_instrument_info(int(start), int(offset))
              return self.client.to_df(dataf instrument(self, start=0, offset=100):
          '''
          查询代码列表
          :param start:
          :param offset:
          :return: pd.dataFrame or None
          '''
          with self.client.connect(*self.bestip):
              # nums = self.client.get_instrument_count()
              data = self.client.get_instrument_info(int(start), int(offset))
              return self.client.to_df(data)
docs: 查询代码列表
          :param start:
          :param offset:
          :return: pd.dataFrame or None