data = {
    "北京":{
        "昌平":{"沙河":["oldboy","test"],"天通苑":["鏈接地產","我愛我家"]},
        "朝陽":{"望京":["奔馳","陌陌"],"國貿":["CICC","HP"],"東直門":["advent","飛信"]},
        "海澱":{}
    },
    "山東":{
        "德州":{},
        "青島":{},
        "濟南":{}
    },
    "廣東":{
        "東莞":{},
        "常熟":{},
        "佛山":{}
    }
}
exit_flag = False
while not exit_flag:
    for i in data:
        print(i)
    choice_s = input("請輸入以上任一省或直轄市名稱>>>:")
    if choice_s in data:
        while not exit_flag:
            for i in data[choice_s]:
                print("\t",i)
            choice_q = input("請輸入以上任一市區名稱>>>:")
            if choice_q in data[choice_s]:
                while not exit_flag:
                    for i in data[choice_s][choice_q]:
                        print("\t\t",i)
                    choice_j = input("請輸入以上任一街道名稱>>>:")
                    if choice_j in data[choice_s][choice_q]:
                        for i in data[choice_s][choice_q][choice_j]:
                            print("\t\t",i)
                        last = input("最後一層，按b返回>>>:")
                        if last == "b":
                            pass
                        elif last == "q":
                            exit_flag = True
                    if choice_j == "b":
                        break
                    elif choice_j == "q":
                        exit_flag = True
            if choice_q == "b":
                break
            elif choice_q == "q":
                exit_flag = True


要點：
1、字典的層級關系
2、break是終止本次循環，pass是什麽也不做，一個占位符而已
3、巧妙使用exit_flag = False

while not exit_flag:

 

Python字典實現簡單的三級菜單