关于@property

class Exam(object):
    def __init__(self,score):
        self._score=score
    @property
    def score(self):
        return self._score
    
    @score.setter
    def score(self,value):
        self._score=value

In [16]: v=Exam(67)

In [17]: v.score
Out[17]: 67

In [18]: v.score=40

In [19]: v.score
Out[19]: 40