老男孩三级菜单改进

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":{},
    },
}
exit_flag=False
while not exit_flag:
    for i in data:
        print(i)

    choice=input("选择进入1>>:")
    if choice in data:
        while not exit_flag:
             for i2 in data[choice]:
                 print("\t",i2)
             choice2 = input("选择进入2>>:")
             if choice2 in data[choice]:
                while not exit_flag:
                    for i3 in data[choice][choice2]:
                        print("\t\t",i3)
                    choice3=input("选择进入3>>:")
                    if choice3 in data[choice][choice2]:
                        while not exit_flag:
                            for i4 in data[choice][choice2][choice3]:
                                print("\t\t",i4)
                            choice4 = input("退出q:")
                            if choice4=='b':
                                break
                            elif choice4=='q':
                                exit_flag=True
                    if choice3=='b':
                        break
                    elif choice3 == 'q':
                        exit_flag = True
             if choice2=='b':
                break
             elif choice2 == 'q':
                exit_flag =True
来自老男孩视频