老男孩三级菜单

data={
    "北京":{
        '昌平':{
            '沙河':["oldboy","test"]},
        '朝阳':{
            "国贸":["CICC","mm"]}
    },
    '山东':{
    "德州": {},
    "青岛": {},
    "济南": {},
         },
    '广东':{
    "东莞":{},
    "常熟":{},
    "佛山":{},
    },
}
while True:
    for i in data:
        print(i)

    choice=input("选择进入1>>:")
    if choice in data:
        while True:
             for i2 in data[choice]:
                 print("	",i2)
             choice2 = input("选择进入2>>:")
             if choice2 in data[choice]:
                while True:
                    for i3 in data[choice][choice2]:
                        print("		",i3)
                    choice3=input("选择进入3>>:")
                    if choice3 in data[choice][choice2]:
                        while True:
                            for i4 in data[choice][choice2][choice3]:
                                print("		",i4)
                            choice4 = input("退出q:")
                            if choice4=='b':
                                break
                    if choice3=='b':
                        break
             if choice2=='b':
                break
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