class Student(object):    def __init__(self, name, score,age):        self.name = name        self.score = score        self.age = age    def bijiao(self):        if self.score>80:            return 'A'        else:            return 'B'    def print_score(self):        print('%s %s %s %s' % (self.name, self.score,self.age,self.bijiao()))sc=Student('songc',88,21)lc=Student('lin',77,18)sc.print_score()lc.print_score()