class Industry:

    def __init__(self):
        self.industry_id = None
        self.name = None
        self.introduction = None
        self.positive_factor = None
        self.negative_factor = None
        self.sub_industries = None


class SubIndustry:

    def __init__(self):
        self.sub_industry_id = None
        self.superior_industry = None
        self.name = None
        self.statistics_field = None
        # self.




class IndustryReport:

    def __init__(self):
        self.report_id = None
        self.report_name = None