# 访问限制的保护，代码更加健壮class Student(object):    def __init__(self,name,score):        self.__name= name        self.__score = score        def print_scrore(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):        if 0<=score<=100:            self.__score=score        else:            raise ValueError('bad score')bart = Student('frank',100)print(bart.get_name())print(bart.get_score())