#模拟@property 实现将类的函数属性变成类属性:

#定义描述符

class msf():

    def __init__(self,obj):

        self.obj = obj

    def __get__(self, instance, owner):

        if instance is None:

            return self

        re = self.obj(instance)

        instance.__dict__[self.obj.__name__] = re

        return re

class Test():

    def __init__(self,x,y):

        self.x = x

        self.y = y

    @msf

    # @property

    def area(self):

        area = self.x*self.y

        return area

a = Test(43856,2986)

print(a.area)

print(Test.area)

print(a.__dict__)

#第二次访问属性,就没有触发get方法,直接在实例属性中提取数据

print(a.area)