1 stu_list = [] 2 def func1(): 3     num_srt = input('请输入新生学号：') 4     num = int(num_srt) 5     name = input('请输入新生姓名：') 6     age = input('请输入新生年龄：') 7     stu = {
   'stu_num':num,'stu_name':name,'stu_age':age} 8     stu_list.append(stu) 9     print('添加成功')10 11 def func2():12     num_str = input('请输入学生学号：')13     num = int(num_str)14     is_exists = True15     for stu in stu_list:16         num1 = stu.get('stu_num')17         if num1 == num:18             stu_list.remove(stu)19             print('删除成功！')20             is_exists = False21     if is_exists:22             print('你输入的学号不存在！')23 24 def func3():25     num_str = input('请输入要修改信息学生的学号：')26     num = int(num_str)27     is_exists = True28     for stu in stu_list:29         num1 = stu.get('stu_num')30         if num1 == num:31             print('学号是：',stu.get('stu_num'),'姓名是：',stu.get('stu_name'),'年龄是：',stu.get('stu_age'))32             new_age = input('请输入新的年龄：')33             stu['stu_age']= int(new_age)34             print('修改成功！')35             is_exists = False36     if is_exists:37         print('你输入的学号不存在！')38 39 def func4():40     num = int(input('请输入学号：'))41     is_exists = True42     for stu in stu_list:43         num1 = stu.get('stu_num')44         if num1 == num:45             print('学号是：',stu.get('stu_num'),'姓名是：',stu.get('stu_name'),'年龄是：',stu.get('stu_age'))46             is_exists = False47     if is_exists:48         print('学号输入有误，请查证后再输入！')49 50 def main():51     while True:52         choice = input('A、添加学生 B、根据学号删除学生 C、修改信息 D、查询 E、退出')53         if choice == 'A' or choice == 'a':54             func1()55         elif choice == 'B' or choice == 'b':56             func2()57         elif choice == 'C' or choice == 'c':58             func3()59         elif choice == 'D' or choice == 'd':60             func4()61         elif choice == 'E' or choice == 'e':62             break63     print('当前班级学生信息：')64     for stu in stu_list:65         print('学号是：',stu.get('stu_num'),'姓名是：',stu.get('stu_name'),'年龄是：',stu.get('stu_age'))66         print('****'*10)67 68 main()