# 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)