(使用Python shell编写)
>>> o = object()
>>> o.test = 1
Traceback (most recent call last):
File "<pyshell#45>", line 1, in <module>
o.test = 1
AttributeError: 'object' object has no attribute 'test'
>>> class test1:
pass
>>> t = test1()
>>> t.test
Traceback (most recent call last):
File "<pyshell#50>", line 1, in <module>
t.test
AttributeError: test1 instance has no attribute 'test'
>>> t.test = 1
>>> t.test
1
>>> class test2(object):
pass
>>> t = test2()
>>> t.test = 1
>>> t.test
1
>>>
为什么对象不允许您向其中添加属性?