class C:
def __getattr__(self, name):
print(1)
return super().__getattr__(name)
def __getattribute__(self, name):
print(2)
return super().__getattribute__(name)
def __setattr__(self, name, value):
print(3)
super().__setattr__(name, value)
def __delattr__(self, name):
print(4)
super().__delattr__(name)
c = C()
c.x
# 显示结果为：
Traceback (most recent call last):
2
File "E:/Python Program/test.py", line 128, in <module>
1
c.x
File "E:/Python Program/test.py", line 113, in __getattr__
return super().__getattr__(name)
AttributeError: ‘super‘ object has no attribute ‘__getattr__‘
原因：
首先c.x会先调用getattribute()魔法方法，打印2；
然后调用super().getattribute()，找不到属性名x，
因此会紧接着调用getattr()魔法方法，于是打印1，
然后调用super().getattr()。但是Python会告诉你AttrError，super对象木有getattr()!!__getattr__，getattribute，setattr，delattr的区别
原文：http://blog.51cto.com/13914991/2175589