property裝飾器

property裝飾器的作用，其實就是將將函數屬性偽裝成為屬性的的裝飾器

class People:
    def __init__(self,name,weight,height):
        self.name = name
        self.weight =weight
        self.height=height

    @property
    def bmi(self):
        return self.weight/(self.height**2)


msj = People(‘msj‘,82,1.84)
print(msj.bmi)
 
#24.22022684310019

但是這這只是偽裝成屬性的，修改並不像屬性一樣能被修改

解決方案一：

class People:
    def __init__(self,name,weight,height):
        self.name = name
        self.__weight =weight
        self.__height=height

    #接口顯示身高
    @property
    def height(self):
         print(self.__height)
    #接口修改身高屬性
    @height.setter
    
 
def height(self,h):
        self.__height = h
    #接口刪除身高屬性
    @height.deleter
    def height(self):
        del self.__height

p2 = People(‘egon‘,70,182)
p2.height
p2.height=183
p2.height
del p2.height
print(p2.__dict__)

“”“
182
183
{‘name‘: ‘egon‘, ‘_People__weight‘: 70}
”“”

方案二

class People:
    
 
def __init__(self,name,weight,height):
        self.name = name
        self.__weight =weight
        self.__height=height

    #接口顯示身高

    def tell_height(self):
         print(self.__height)
    #接口修改身高屬性

    def set_height(self,h):
        self.__height = h
    #接口刪除身高屬性

    def del_height(self):
        del self.__height

    height = property(tell_height,set_height,del_height)

p2 = People(‘egon‘,70,182)
p2.height
p2.height=183
p2.height
del p2.height
print(p2.__dict__)

面向對象——property裝飾器