python
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 修改第二行的参数，现在默认是None
class MyDes:
def __init__(self, initval=None, name='老乌龟'):
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~")
>>> a = MyDes()
>>> a.name
'老乌龟'
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