class Student(object):

    def __init__(self,name,score):
        self.__name=name
        self.__score=score
        
    def print_score(self):
        print('%s: %s' % (self.__name,self.__score))
    def get_name(self):
        return self.__name
    def get_score(self):
        return self.__score
    def set_score(self,score):
        if 0<=score<=100:
            self.__score=score
        else:
            raise ValueError('bad score')
ZY=Student('ZY',100)
ZL=Student('ZL',99)
ZY.print_score()
ZL.print_score()

