class Scope:
    allow_api = []
    allow_module = []
    forbidden = []

    def __add__(self, other):
        self.allow_api = self.allow_api + other.allow_api
        self.allow_api = list(set(self.allow_api))
        # 运算符重载

        self.allow_module = self.allow_module + other.allow_module
        self.allow_module = list(set(self.allow_module))

        self.forbidden = self.forbidden + other.forbidden
        self.forbidden = list(set(self.forbidden))

        return self

    七月老师，这里有三个类变量，为什么我们可以使用self访问类变量呢