菜单一

#Author: Administrator
#Date: 2019/7/2 - 8:53

menu = {
    '北京':{
        '朝阳':{
            '国贸':{
                'CICC':{},
                'HP':{},
                '渣打银行':{},
                'CCTV':{},
            },
            '望京':{
                '陌陌':{},
                '奔驰':{},
                '360':{},
            },
            '三里屯':{
                '优衣库':{},
                'apple':{}
            },
        },
        '昌平':{
            '沙河':{
                "老男孩":{},
                "阿泰包子":{},
            },
            '天通苑':{
                "链家":{},
                "我爱我家":{}
            },
            '回龙观':{},
        },
        '海淀':{
            "五道口":{
                "google":{},
                "谷歌":{},
                "网易":{},
                "Sohu":{},
                "Sogo":{},
                "快手":{},
            },
            "中关村":{
                "youku":{},
                "Iqiyi":{},
                "汽车之家":{},
                "新东方":{},
                "QQ":{},
            }
        },
    },
    '上海':{
        "浦东":{
            "陆家嘴":{
                "CICC":{},
                "高盛":{},
                "摩根":{},
            },
            "外滩":{},
        },
        "闵行":{},
        "静安":{},
    },
    '山东':{
      "济南":{},
      "德州":{
          "乐陵":{
              "丁务镇":{},
              "城区":{},
          },
          "平原":{},
      },
    },
}


back_flag = False
exit_flag = False
while not back_flag and not exit_flag:
    for key in menu:
        print(key)
    choice = input(">>:").strip()
    if choice == 'q':
        exit_flag = True 
    if choice in menu:
        while not back_flag and not exit_flag:
            for key2 in menu[choice]:
                print(key2)
            choice2 = input(">>:").strip()
            if choice2 == 'b':
                back_flag = True
            if choice2 == 'q':
                exit_flag = True
            if choice2 in menu[choice] :
                while not back_flag and not exit_flag:
                    for key3 in menu[choice][choice2] :
                        print(key3)
                    choice3 = input(">>:").strip()
                    if choice3 == 'b':
                        back_flag = True
                    if choice3 == 'q':
                        exit_flag = True
                    if choice3 in menu[choice][choice2] :
                        while not back_flag and not exit_flag:
                            for key4 in menu[choice][choice2][choice3] :
                                print(key4)
                            choice4 = input('>>:').strip()
                            print('last level')
                            if choice4 == 'b':
                                back_flag = True
                            if choice4 == 'q':
                                exit_flag = True
                        else:
                            back_flag = False
                else:
                    back_flag = False
        else :
            back_flag = False