简单的三级菜单

#!/usr/bin/env python
#-*- coding:utf-8 -*-
#3.0python版本以上运行

city = {
    'sicuan':{'chengdu':{'wuhouqu':['xxx','111']}},
    'guangdong':{'guangzhou':{'huaduqu':['yyy','222']}}
}

while True:
    for i in city:
        print(i)
    choice = input("choice_begin>>>")
    if choice in city:
        for i2 in city[choice]:
            print(i2)
        choice2 = input("chice2>>>")
        if choice2 in city[choice]:
            for i3 in city[choice][choice2]:
                print(i3)
            choice3 = input("chice3>>>")
            if choice3 in city[choice][choice2]:
                for i4 in city[choice][choice2][choice3]:
                    print(i4)
                choice4= input("输入Q退出或者回车继续>>>")
                if choice4 == 'Q' or choice4 == 'q':
                    exit()