python字典查询功能

def fetch(data):
    print(' 查询功能')
    print('用户数据是',data)

def add():
    pass

def change():
    pass

def delete():
    pass

if __name__ == '__main__':

    msg = '''
    1: 查询
    2. 添加
    3. 修改
    4. 删除
    5. 退出
    '''

    msg_dict = {
        '': fetch,
        '': add,
        '': change,
        '': delete
    }

    while True:
        print(msg)
        choice = input('请输入你的选项:').strip()

        if not choice:
            continue
        if choice == '':
            break

        data = input('请输入你的数据：').strip()
        msg_dict[choice](data)