定义函数

def input_score(): num = input("请输入学号：") score1 = float(input("请输入第一门课程成绩：")) score2 = float(input("请输入第二门课程成绩：")) score3 = float(input("请输入第三门课程成绩：")) total_score = score1 + score2 + score3 return num, total_score

主程序

scores = [] for i in range(3): num, total_score = input_score() scores.append((num, total_score)) scores.sort(key=lambda x:x[1], reverse=True) print("按总成绩从大到小排列的学生信息如下：") for s in scores: print("学号：%s，总成绩：%s" % (s[0], s[1]))