python - class propert应用

propert应用

#方式一:
# class Student(object):
#     def __init__(self,name,sc):
#         self.name = name
#         self.sc = sc
#
#     @property
#     def score(self):
#         return self.sc
#
#     @score.setter
#     def score(self,value):
#         if not isinstance(value, int):
#             raise ValueError('分数必须是整数才行呐')
#         if value < 0 or value > 100:
#             raise ValueError('分数必须0-100之间')
#         self.sc = value
#
#     @score.deleter
#     def score(self):
#         del self.sc

#-----------------------------------------------------------

#方式二:
class Student(object):
    def __init__(self,name,sc):
        self.name = name
        self.sc = sc

    def get_score(self):
        return self.sc

    def set_score(self,value):
        if not isinstance(value, int):
            raise ValueError('分数必须是整数才行呐')
        if value < 0 or value > 100:
            raise ValueError('分数必须0-100之间')
        self.sc = value

    def del_score(self):
        del self.sc

    score = property(get_score,set_score,del_score)

X = Student('anec',50)
print(X.__dict__)
print(X.score)
X.score = 90
print(X.score)
del X.score
print(X.__dict__)