# Subject 课程。
class Subjects():        
    subjects=[]
    def input(cls):
        while True:
            cls.subjects.append(input('请输入课程名称：'))
            if input('继续输入课程吗？若输入n，则结束课程输入') in ['n','N']:
                break
class Student():
    def __init__(self,subjects):
        self.name=''
        self.sum=0
        self.grades={}
        self.subjects=subjects
    def input(self): # 输入此学生的成绩
        self.name=input('请输入学生姓名：')
        print('请输入各门课成绩：')
        for i in self.subjects:
            print(i,end='：')
            score=int(input())
            self.grades[i]=score
        self.sum=sum(self.grades.values())
        self.grades['总分']=self.sum
    def output(self): # 输出成绩
        print(self.name,'\t',end='')
        for i in self.grades:
            print(self.grades[i],'\t',end='')
def main():
    print('***学生成绩管理系统***')
    Subjects.input(Subjects) # 输入课程
    students=[]
    while True:
        student=Student(Subjects.subjects) # 创建1个学生
        student.input() # 输入此学生的所有成绩
        students.append(student) # 放入学生群
        if input('继续输入学生吗：(y/n)?') in ['n','N']:
            break
    students.sort(key=lambda x:x.grades['总分'],reverse=True)
    print('***结果为：***')
    print('总分最高分：',students[0].grades['总分'])
    print('总分最低分：',students[-1].grades['总分'])
    print('姓名','\t',end='')
    for i in Subjects.subjects: # 显示表头
        print(i,'\t',end='')
    print()
    for stu in students:
        print(stu.name,'\t',end='')
        for subject in stu.grades:
            print(stu.grades[subject],'\t',end='')
        print()
if __name__=='__main__':
    main()