property自己实现

# 先回顾一下
class room:
    def __init__(self,name,width,length):
        self.name = name
        self.width = width
        self.length = length
    @property
    def area(self):
        return self.width * self.length
r1 = room('wang',100,100)
print(r1.area)

class lazyproperty:
    def __init__(self,func):
        self.func = func
    def __get__(self,instance,owner):
        print("我们自己定义的属性")
        if instance is none:
            return self
        return self.func(instance)
class room:
    def __init__(self,name,width,length):
        self.name = name
        self.width = width
        self.length = length
    @lazyproperty
    # area = lazyproperty(area)
    # 现在area是一个类，而不是函数
    def area(self):
        # print(self.area)
        return self.width * self.length
r1=room('alex',1,1)
print(r1.area)