def sector_code(self):
        """
        [str] 板块缩写代码，全球通用标准定义（股票专用）
        """
        try:
            return self.__dict__["sector_code"]
        except (KeyError, ValueError):
            raise AttributeError(
                "Instrument(order_book_id={}) has no attribute 'sector_code' ".format(self.order_book_id)
            )