python

Wayneee

class MyDes:
    def __init__(self, initval=None, name=None):
        self.val = initval
        self.name = name

    def __get__(self, instance, owner):
        print("正在获取变量：", self.name)
        return self.val

    def __set__(self, instance, value):
        print("正在修改变量：", self.name)
        self.val = value

    def __delete__(self, instance):
        print("正在删除变量：", self.name)
        print("噢~这个变量没法删除~")
课后作业046这个题怎么设置name呀，我打印出来是None，不知道怎么设置，求助

逃兵

修改第二行的参数，现在默认是None

1. class MyDes:
   
2.     def __init__(self, initval=None, name='老乌龟'):
   
3.         self.val = initval
   
4.         self.name = name
   
5. 
   
6.     def __get__(self, instance, owner):
   
7.         print("正在获取变量：", self.name)
   
8.         return self.val
   
9. 
   
10.     def __set__(self, instance, value):
    
11.         print("正在修改变量：", self.name)
    
12.         self.val = value
    
13. 
    
14.     def __delete__(self, instance):
    
15.         print("正在删除变量：", self.name)
    
16.         print("噢~这个变量没法删除~")

复制代码

1. >>> a = MyDes()
   
2. >>> a.name
   
3. '老乌龟'

复制代码