# coding:utf-8
"""
property:负责把方法变成属性
""" class Student(object): def get_score(self):
return self._score def set_score(self, score):
if not isinstance(score, int):
raise ValueError('score must be an instance!')
if score<0 or score>100:
raise ValueError('score must between 0--100!')
self._score = score s =Student()
s.set_score(60)
print s.get_score() #s.set_score(200) """
下面的方法既能检查参数，又可以用类似属性这样简单的方式来访问类的变量
把一个getter方法变成属性，只需要加上@property.
此时@property本身又创建了另一个装饰器@score.setter，负责把一个setter方法变成属性赋值
"""
class Student2(object): @property
def score(self):
return self._score @score.setter
def score(self, score):
if not isinstance(score, int):
raise ValueError('score must be an instance!')
if score<0 or score>100:
raise ValueError('score must between 0--100!')
self._score = score s = Student2()
s.score =50
print s.score
#s.score = 120 """
利用@property定义只读属性，只定义getattr，不定义setattr即可
"""
class Student3(object): @property
def birth(self):
return self._birth @birth.setter
def birth(self,value):
self._birth = value @property
def age(self):
return 2016 - self._birth s = Student3()
s.birth = 1988
print s.birth
print s.age