from datetime import date, datetime

class User:

    def __init__(self, name, birthday):

        self.name = name

        self.birthday = birthday

        self._age = 0

    # 相当于get操作

    @property

    def age(self):

        # return datetime.now().year - self.birthday.year

        return self._age

    # 相当于set操作

    @age.setter

    def age(self, value):

        self._age = value

if __name__ == '__main__':

    user = User('lucy', date(year=2000, month=1, day=2))

    print(user.age)  # 如果age方法上没有property装饰器,这样是不行的

    user.age = 66  # 赋值操作

    print(user.age)  # 66 取值操作