虽然写了一段很low的面向过程的并且一边听讲解一边写的代码，但依然是自己写的。

data = {
    "北京":{
        "昌平":{
            "沙河":["oldboy","test"],
            "天通苑":["链家网","我爱我家"],
        },
        "朝阳":{
            "望京":["奔驰","陌陌"],
            "国贸":["CICC","HP"],
            "东直门":["Advent","飞信"],
        },
        "海淀":{},
    },

    "山东":{
        "青岛":{},
        "济南":{},
        "德州":{},
    },

    "广东":{
        "东莞":{},
        "惠州":{},
        "佛山":{},
    }
}

exit_flag = False
while not exit_flag:
    for i in data:
        print(i)

    choice = input("选择进入")
    if choice in data:
        while not exit_flag:
            for i2 in data[choice]:
                print("\t==",i2)
            choice2 = input("选择进入-----按Q退出")
            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-----按Q退出")
                    if choice3 in data[choice][choice2]:
                        for i4 in data[choice][choice2][choice3]:
                             print("\t\t",i4)
                        choice4 = input("最后一层，按b返回")
                        if choice4 == "b":
                            pass
                        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