python Class：面向对象高级编程 @property

Posted 2020-12-05

看不懂，先记录

一、

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

class Student(object):

    @property
    def score(self):
        return self._score

    @score.setter      #setter是哪里来的？？作用呢？？？
    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

s = Student()
s.score = 60
print s.score

运行结果：60

二、

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

class Student1(object):

    @property       #？？？？
    def birth(self):
        return self._birth

    @birth.setter    #？？？？
    def birth(self, value):
        self._birth = value

    @property       #？？？？
    def age(self):
        return 2014 - self._birth

s = Student1()
s.birth = 60
print s.age

运行结果：60