_作業要求

1. 運行程序輸出第一級菜單

2. 選擇一級菜單某項，輸出二級菜單，同理輸出三級菜單

3. 菜單數據保存在文件中

4. 讓用戶選擇是否要退出

5. 有返回上一級菜單的功能

評分標準：

用多層嵌套while循環的方式完成作業2，85分

只用一層循環完成作業2，100分

_{SAMPLE 1}

data = {
    ‘北京‘: {
        ‘海澱‘: {
            ‘五道口‘: {
                ‘soho‘: {},
                ‘網易‘: {},
                ‘Google‘: {},
            },
            
 
‘中關村‘: {
                ‘愛奇藝‘: {},
                ‘汽車之家‘: {},
                ‘youku‘: {},
            },
            ‘上地‘: {
                ‘baidu‘: {},
            },
        },
        ‘昌平‘: {
            ‘沙河‘: {
                ‘oldboy‘: {},
                ‘北航‘: {},
            },
            
 
‘天通苑‘: {},
            ‘回龍觀‘: {},
        },
        ‘朝陽‘: {},
        ‘東城‘: {},
    },
    ‘上海‘: {
        "黃浦": {
            ‘人民廣場‘: {
                ‘炸雞店‘: {},
            },
        },
        ‘閘北‘: {
            ‘火車站‘: {
                ‘攜程‘: {},
            },
        },
        ‘浦東‘: {},
    },
    
 
‘山東‘: {},
}

exit_flag = False

while not exit_flag:
    for i in data:
        print(i)   # 進入死循環

    choice = input("your option >>>:")
    if choice in data:
        while not exit_flag:
            for j in data[choice]:
                print("\t", j)
            choice2 = input(‘your 2nd option >>>:‘)
            while not exit_flag:
                for k in data[choice][choice2]:
                    print(‘\t\t‘, k)
                choice3 = input(‘your 3rd option >>>:‘)
                if choice3 in data[choice][choice2]:
                    for l in data[choice][choice2][choice3]:
                        print(‘\t\t‘, l)
                    choice4 = input("final, please input b for exit")
                    if choice4 == ‘b‘:
                        pass  # pass == 啥都不做，必須寫否則報錯。作為占位符
                    elif choice4 == "q":
                        exit_flag = True
                if choice3 == ‘b‘:
                    break
                elif choice3 == "q":
                    exit_flag = True
            if choice2 == ‘b‘:
                break
            elif choice2 == "q":
                exit_flag = True

Python 基礎 - Day 1 Assignment - Three tier menu 三級菜單