Python3学习之路~2.5 简单的三级菜单程序

程序：
三级菜单

需求：

1.打印省、市、县三级菜单
2.可返回上一级
3.可随时退出程序

代码（有点low...）：

data={
    "山东":{
        "济南":["历下区","高新区","长清区"],
        "日照":["东港区","五莲县","岚山区"],
        "青岛":["崂山区","黄岛区","市中区"]
    },
    "陕西": {
        "西安": ["雁塔区", "高新区", "未央区"],
        "延安": ["宝塔区", "宜川县", "黄陵县"],
        "宝鸡": ["陈仓区", "岐山县", "太白县"]
    }
}

while True:
    for i in data:
        print(i)
    choice = input("请选择进入：")
    if choice in data:
        while True:
            for i2 in data[choice]:
                print('\t',i2)
            choice2 = input("请选择进入：")
            if choice2 in data[choice]:
                while True:
                    for i3 in data[choice][choice2]:
                        print('\t\t',i3)
                    choice3=input("最后一级，请输入q退出或输入b返回上一级：")
                    if choice3 == 'b':
                        break
                    elif choice3 == 'q':
                        exit()
                    else:
                        print("无效输入！")
            elif choice2 == 'b':
                break
            elif choice2 == 'q':
                exit()
            else:
                print("无效输入！")
    elif choice == 'q':
        exit()
    else:
        print("无效输入！")

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