Python 类实例化时变换实例的类

代码：

 

class a(): def p(self): print 'a' def ap(self): print 'ap' class b(): def __init__(self): print self.__class__ self.__class__ = a print self.__class__ def p(self): print 'b' def bp(self): print 'bp' i = b() i.p() i.ap() i.bp()

 

显示结果：

 

__main__.b
__main__.a
a
ap
Traceback (most recent call last):
  File "D:/Workspace/eclipse/pytest/main.py", line 33, in <module>
    i.bp()
AttributeError: a instance has no attribute 'bp'

 

 

测试环境：

 

Python 2.5

Windows XP SP2