code: def industry_name(self):
          
          try:
              return self.__dict__["industry_name"]
          except (KeyError, ValueError):
              raise AttributeError(
                  "Instrument(order_book_id={}) has no attribute 'industry_name' ".format(self.order_book_id)
              )
docs: [str] 国民经济行业分类名称（股票专用）