class?Programer(object):
????hobby='play?computer'
????def?__init__(self,name,age,weight):
????????self.name=name
????????self._age=age
????????self.__weight=weight
????def?self_intro(self):
????????print?'my?name?is?%s?\nI?am?%s?years?old\n'?%?(self.name,?self._age)
class?BackendProgramer(Programer):
????def?__init__(self,name,age,weight,language):
????????super(BackendProgramer,self).__init__(name,age,weight)
????????self.language?=?language
????def?self_intro(self):
????????print?'my?name?is?%s?\nmy?favourite?language?is?%s\n'?%?(self.name,?self.language)
def?intro(i):
????if?isinstance(i,Programer):
????????print?i.self_intro
if?__name__=='__main__':
????prog?=?Programer('Albert',25,'80')
????back_prog?=?BackendProgramer('Alex',23,'80','Ruby')
????intro(prog)
????intro(back_prog)

運行結(jié)果是：

<bound method Programer.self_intro of <__main__.Programer object at 0x030A5490>>

<bound method BackendProgramer.self_intro of <__main__.BackendProgramer object at 0x030A5510>>