Python学习作业二

# 学生管理系统
# 定义功能界面函数
def info_views():
    print('请选择功能:')
    print('1、添加学员')
    print('2、删除学员')
    print('3、修改学员')
    print('4、查询学员')
    print('5、显示所有学员')
    print('6、退出系统')
    print('-'*20)

info = []  # 全局变量

def add_use():
    """添加函数"""
    new_id = input('请输入学号:')
    new_name = input('请输入姓名:')
    new_sex = input('请输入性别:')
    global info
    for i in info:
        if new_id == i['id']:
            print('该用户号已经存在，本次操作无效。')
            return
    info_new = {}  # 字典，不存在就创建，存在则修改
    info_new['id'] = new_id
    info_new['name'] = new_name
    info_new['sex'] = new_sex
    print(info_new)
    info.append(info_new)
    print(info)

def del_use():
    """删除函数"""
    del_id = input('请输入删除用户的id:')
    global info
    for i in info:
        if del_id == i['id']:
            info.remove(i)  # 移除数据用remove 移除下标数据用pop
            break
    else:
        print('您输入的id不存在，无法删除。')
    print(info)

def modify_use():
    """修改函数"""
    modify_id = input('请输入需修改的id:')
    global info
    for i in info:
        if modify_id == i['id']:
            new_name = input('请输入新名字:')
            new_sex = input('请输入新性别:')
            i['name'] = new_name
            i['sex'] = new_sex
            break
    else:
        print('您输入的id无效。')
    print(info)

def search_use():
    """查询函数"""
    search_id = input('请输入查询id:')
    global info
    for i in info:
        if search_id == i['id']:
            print('信息如下：')
            print(f"编号:{i['id']}, 姓名:{i['name']}, 性别:{i['sex']}")
            break
    else:
        print('您输入的id无效。')

def views():
    """显示所有信息"""
    global info
    print("学号\t姓名\t性别")
    for i in info:
        print(f"{i['id']}\t{i['name']}\t{i['sex']}")

while True:
    # 显示功能界面
    info_views()

    # 用户输入功能
    user_num=int(input('请输入需求功能序号:'))
    if user_num == 1:
        add_use()
    elif user_num == 2:
        del_use()
    elif user_num == 3:
        modify_use()
    elif user_num == 4:
        search_use()
    elif user_num == 5:
        views()
    elif user_num == 6:
        print('退出')
        break
    else:
        print('您输入的序号有误，请从新输入！')

# 依照用户输入的序号，执行不同的功能

# 循环操作，直至退出

存在不足，请多指教。