Python函数初级应用之学员系统管理

# 定义功能界面函数
def info_print():
    print('select function please')
    print('1.add')
    print('2.delete')
    print('3.modify')
    print('4.search')
    print('5.show')
    print('6.exit')
    print('-' * 20)


# 等待存储所有学员的信息
info = []


# 添加学员信息的函数
def add_info():
    """添加学员函数"""
    new_name = input('input name please: ')
    new_id = input('input id please: ')
    new_tel = input('input phone number please: ')
    global info
    # 不允许姓名重复，判断用户输入的姓名和列表里面字典的Name对应的值相等则提示
    for i in info:  # 遍历列表
        if i['name'] == new_name:
            print('name already exists !')
            return  # 退出当前函数add_info()
    info_dict = {}
    info_dict['name'] = new_name
    info_dict['id'] = new_id
    info_dict['tel'] = new_tel
    print(info_dict)
    # 列表追加字典
    info.append(info_dict)
    print(info)


# 删除学员
def del_info():
    """删除学员"""
    del_name = input('name of member you are going to delete: ')
    global info  # 声明全局变量
    for i in info:
        if del_name == i['name']:
            info.remove(i)  # 删除列表里的字典
            break  # 由于系统不需要重名，所以删除完数据后不需要再遍历
        else:
            print('this member does not exist !')
    print(info)


# 修改学员信息
def modify_info():
    """修改学员信息"""
    modify_name = input('name of member you are going to modify: ')
    global info
    for i in info:
        if modify_name == i['name']:
            i['id'] = input('id you are going to modify:')
            i['tel'] = input('phone number you are going to modify:')
            break
    else:  # 遍历之后才能报错
        print('this member does not exist !')
    print(info)


# 查询学员信息
def search_info():
    """查询学员信息"""
    search_name = input('name of member you are going to search for: ')
    global info
    for i in info:
        if i['name'] == search_name:
            print(f"该学员的学号是{i['id']}, 姓名是{i['name']}, 手机号是{i['tel']}")
            break
    else:
        print('this member does not exist !')


# 打印所有学员信息
def print_all():
    """显示所有学员信息"""
    print(f"name\tid\ttel")
    global info
    for i in info:
        print(f"{i['name']}\t\t{i['id']}\t{i['tel']}")
# 系统功能需要循环使用，直到用户输入6才退出
while True:
    # 1、显示功能界面
    info_print()
    # 2. 用户输入功能序号
    user_name = int(input('请输入功能序号：'))
    # 3. 按照用户输入的功能序号，执行不同的功能
    if user_name == 1:
        # print('add')
        add_info()
    elif user_name == 2:
        # print('delete')
        del_info()
    elif user_name == 3:
        # print('modify')
        modify_info()
    elif user_name == 4:
        # print('search')
        search_info()
    elif user_name == 5:
        # print('show all')
        print_all()
    elif user_name == 6:
        # print('exit')
        exit_flag = input('are you sure to exit? y or n: ')
        if exit_flag == 'y':
            print('system exits successfully! Thank you for using')
            break
    else:
        print('error!')