#@Property  就是java中的get 和set    在python中 将 函数变为属性一样去使用
class Student(object):
    @property
    def score(self):
         return self._score
    @score.setter
    def score(self, value):
        if not isinstance(value, int):
            raise ValueError('score must be an integer!')
        if value < 0 or value > 100:
            raise ValueError('score must between 0 ~ 100!')
        self._score = value
A=Student()
A.score=20
print(A.score)