自定制prooerty:

#模擬@property 實現將類的函數屬性變成類屬性:

#定義描述符
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__)

#第二次訪問屬性,就沒有觸發get方法,直接在實例屬性中提取數據
print(a.area)

python - 自定制property/property的延時計算