__slots__为什么没有报错，依然赋值了没有的age

class Person:

    __slots__ = ('name','gender')

    def __init__(self,name,gender):

        self.name = name

        self.gender = gender

class Student(Person):

    __slots__ = ('name', 'gender','score')

    def __init__(self, name, gender,score):

        super().__init__(name, gender)

        self.score = score

Student.age = 12

s = Student('qrh','男',88)

print(s.name,s.gender,s.score,s.age) #》》qrh 男 88 12