用python来设计一个学生通讯系统

def menu()://用函数来输入
    print('-' * 40)
    print('通讯录管理系统V1.0')
    print('1、添加学员信息')
    print('2、删除学员信息')
    print('3、修改学员信息')
    print('4、查询学员信息')
    print('5、遍历所有学员信息')
    print('6、退出系统')
    print('-' * 40)
info = []
def add_student():
    info_dict = {}
    info_dict['name'] = input('请输入学员姓名：')
    info_dict['age'] = int(input('请输入学员年龄：'))
    info_dict['mobile'] = input('请输入学员电话：')
    global info
    info.append(info_dict)
    print('学员信息添加成功')
    print(info)
def del_student():
    name = input('请输入您要删除学员的姓名：')
    for i in info:
        if i['name'] == name:
            info.remove(i)
            print('学员信息删除成功')
            print(info)
            break
    else:
        print('暂未查询到您要删除的学员信息')
def modify_student():
    name = input('请输入您要修改学员的姓名：')
    global info
    for i in info:
        if i['name'] == name:
            i['name'] = input('请输入修改后的姓名：')
            i['age'] = input('请输入修改后的年龄：')
            i['mobile'] = input('请输入修改后的电话：')
            print('学员信息修改成功')
            print(info)
            break
    else:
        print('暂未查询到您要修改的学员信息')
def show_student():
    name = input('请输入您要查询学员的姓名：')
    for i in info:
        if i['name'] == name:
            print(f'学员姓名:{i["name"]}，学员年龄:{i["age"]}，学员电话：{i["mobile"]}')
            break
    else:
        print('暂未查询到您要查询的学员信息')
def show_all():
    for i in info:
        print(f'学员姓名:{i["name"]}，学员年龄:{i["age"]}，学员电话：{i["mobile"]}')
while True:
    menu()
    user_num = int(input('请输入您要 *** 作的功能序号：'))
    if user_num == 1:
        add_student()
    elif user_num == 2:
        del_student()
    elif user_num == 3:
        modify_student()
    elif user_num == 4:
        show_student()
    elif user_num == 5:
        show_all()
    elif user_num == 6:
        print('感谢您使用通讯录管理系统V1.0')
        break
    else:
        print('信息输入错误，请重新输入...')