data={
    "北京":{
        '昌平':{
            '沙河':["oldboy","test"]},
        '朝陽':{
            "國貿":["CICC","mm"]}
    },
    '山東':{
    "德州": {},
    "青島": {},
    "濟南": {},
         },
    '廣東':{
    "東莞":{},
    "常熟":{},
    "佛山":{},
    },
}
while True:
    for i in data:
        print(i)

    choice=input("選擇進入1>>:")
    if choice in data:
        while True:
             for i2 in data[choice]:
                 print("\t",i2)
             choice2 = input("選擇進入2>>:")
             if choice2 in data[choice]:
                while True:
                    for i3 in data[choice][choice2]:
                        print("\t\t",i3)
                    choice3=input("選擇進入3>>:")
                    if choice3 in data[choice][choice2]:
                        while True:
                            for i4 in data[choice][choice2][choice3]:
                                print("\t\t",i4)
                            choice4 = input("退出q:")
                            if choice4=='b':
                                break
                    if choice3=='b':
                        break
             if choice2=='b':
                break
來自老男孩課件