class S:
    def __init__(self,name,looks):
        self.__name=name
        self.__looks=looks
    def run1(self):
        print('%s is %s' %(self.__name,self.__looks))

class S1(S):
    def __init__(self,name,looks,characters):
        super().__init__(name,looks)
        #或者S.__init__(self,name,looks)
        self.__characters=characters
    def run2(self):
        print('%s is not %s but also %s' %(self._S__name,self._S__looks,self.__characters))

class Z:
    def run1(self):
        print('I\'am MK!')
    def run2(self):
        print('I love xinhui!')

def ling(x):
    x.run1()
    x.run2()