code: def sector_code_name(self):
          
          try:
              return self.__dict__["sector_code_name"]
          except (KeyError, ValueError):
              raise AttributeError(
                  "Instrument(order_book_id={}) has no attribute 'sector_code_name' ".format(self.order_book_id)
              )
docs: [str] 以当地语言为标准的板块代码名（股票专用）