stu_info = []
def print_menu():
    print('学生管理系统')
    print('1.添加学员')
    print('2.删除学员')
    print('3.修改学员信息')
    print('4.查询学员信息')
    print('5.显示所有学员信息')
    print('6.保存学员信息')
    print('7.退出系统')
#1.添加
def add_stu_info():
    name = input('请输入新学生的姓名：')
    sex = input('请输入新学生的性别：')
    phone = input('请输入新学生的手机号码：')
    new_info = dict()  # 定义一个字典
    new_info['name'] = name
    new_info['sex'] = sex
    new_info['phone'] = phone
    stu_info.append(new_info)
#2.删除
def del_stu_info(student):
    if len(student) != 0:
        del_num = int(input('请输入要删除的序号：')) - 1
        if del_num < len(stu_info):
            del student[del_num]
            print(f'删除指定序号：{del_num + 1}成功')
        else:
            print('要删除的序号有误')
    else:
        print('学生信息表为空')
#3.修改
def rev_stu_info():
    if len(stu_info) != 0:
        rev_num = int(input('请输入要修改学生的序号：')) - 1
        if rev_num >= len(stu_info):
            print("要修改的序号有误")
        else:
            rev_name = input('请输入要修改学生的姓名：')
            rev_sex = input('请输入要修改学生的性别：')
            rev_phone = input('请输入要修改学生的手机：')
            stu_info[rev_num]['name'] = rev_name
            stu_info[rev_num]['sex'] = rev_sex
            stu_info[rev_num]['phone'] = rev_phone
    else:
        print('学生信息表为空')
#4.查询
def que_stu_info():
    if len(stu_info) != 0:
        que_num = int(input('请输入要查询学生的序号：')) - 1
        if que_num >= len(stu_info):
            print("要查询的序号有误")
        else:
            print('学生的信息如下：')
            print('序号  姓名  性别  手机号码')
            print("%s  %s  %s" % (temp_info['name'], temp_info['sex'], temp_info['phone']))
    else:
        print('该学生信息为空')
#5.显示所有学员信息
def show_stu_info():
    if len(stu_info) != 0:
        print('学生的信息如下：')
        print('=' * 30)
        print('序号  姓名  性别  手机号码')
        i = 1
        for temp_info in stu_info:
            print("%d  %s  %s  %s" % (i, temp_info['name'], temp_info['sex'], temp_info['phone']))
            i += 1
    else:
        print('学生信息表为空')

def main():
    while True:
        print_menu()
        key = input('请输入对应的功能的数字：')
        if key == '1':# 添加
            add_stu_info()
        elif key == '2':# 删除
            del_stu_info(stu_info)
        elif key == '3':# 修改
            rev_stu_info()
        elif key == '4':# 查询
            que_stu_info()
        elif key == '5':# 显示所有学生信息
            show_stu_info()
        elif key == '7':# 退出系统
            quit_confirm = input('是否要退出系统？（Yes/No）：')
            if quit_confirm == 'Yes' or quit_confirm == 'yes' or quit_confirm == 'YES':
                break
            elif quit_confirm == 'No' or quit_confirm == 'no' or quit_confirm == 'NO':
                continue
            else:
                print('输入有误，请重新输入')
        else:
            print('输入有误，请重新输入')
if __name__ == '__main__':
    main()