题解 | 班级管理

###这个__str__方法让人疑惑啊
###当使用print输出对象的时候，只要自己定义了__str__(self)方法，那么就会打印从在这个方法中return的数据
__str__方法需要返回一个字符串，当做这个对象的描写
class student:
    def __init__(self, name , num, score, homework):
        self.name= name
        self.num= num
        self.score=score
        self.homework= homework
        self.cnt = len(homework)

    def detail(self):
        print(self.name+'\'s student number is '+self.num+', and his grade is '+self.score+'. He submitted '+ str(self.cnt)+' assignments, each with a grade of '+" ".join(self.homework))

obj = student(input(),input(),input(),input().split())
obj.detail()




return "{}'s student number is {}, and his grade is {}. He submitted {} assignments, each with a grade of {}".format(self.name,self.number,self.grade,self.times,self.level)



class Student:
    def __init__(self, name, stu_num, score, grade):
        self.name = name
        self.stu_num = stu_num
        self.score = score
        self.grade = grade
    #__str__方法用于返回对象的描述信息，如果不使用__str__方法，直接print，或者return，返回的是对象的内存地址。
    def __str__(self): 
        return ("%s's student number is %s, and his grade is %d. He submitted %s assignments, each with a grade of %s"
                % (self.name, self.stu_num, int(self.score), len(self.grade.split()), self.grade))

name1 = input()
stu_num1 = input()
score1 = input()
grade1 = input()
stu = Student(name1, stu_num1, score1, grade1)
print(stu)