#!/usr/bin/env python
#-*- coding:UTF-8 -*-
flag = 0
return_flag = 0
f = open("file3.txt","r",encoding = "utf-8")
dict1 = {}
dict2 = {}
dict3 = {}
dict4 = {}
dict5 = {}
dict6 = {}
ZN = {}
MSK = {}
US = {}
info1 = {}
for i in f:
    if "中國" in i:
        list1 = i.strip().split(":")
        list1[2] = list1[2].strip().split(",")
        list1[4] = list1[4].strip().split(",")
        list1[6] = list1[6].strip().split(",")
        list1[8] = list1[8].strip().split(",")
        dict1[list1[1]] = list1[2]
        dict2[list1[3]] = list1[4]
        dict3[list1[5]] = list1[6]
        dict4[list1[7]] = list1[8]
        ZN.update(dict2)
        ZN.update(dict1)
        ZN.update(dict3)
        ZN.update(dict4)
    if "美國" in i:
        list2 = i.strip().split(":")
        list2[2] = list2[2].strip().split(",")
        dict5[list2[1]] = list2[2]
        US.update(dict5)
    if "俄羅斯" in i:
        list3 = i.strip().split(":")
        list3[2] = list3[2].strip().split(",")
        dict6[list3[1]] = list3[2]
        MSK.update(dict6)
    else:
        pass
f.close()
info1["中國"] = ZN
info1["美國"] = US
info1["俄羅斯"] = MSK

while flag == 0:

    while return_flag == 0 and flag ==0:
        for i in info1:
            print(i)
        choice1 = input("請選擇:")
        return_flag = 1
        break
    while return_flag == 1  and flag == 0:
        for i in info1[choice1]:
            print(i)
        choice2 = input("請輸入地名或按鍵選擇(r:返回上一級，q:退出)")
        if choice2 == "q":
            flag = 1
            break
        if choice2 == "r":
            return_flag = 0
            break
        return_flag = 2
        break
    while return_flag ==  2 and choice2 in info1[choice1] and flag ==0:
        for a in info1[choice1][choice2]:
            print(a)
        choice3 = input("請輸入地名或按鍵選擇(r:返回上一級，q:退出)")
        if choice3 == "q":
            flag = 1
            break
        if choice3 == "r":
            return_flag = 1
            break
        else:
            print("歡迎來到%s!" % choice3)
            flag = 1
            break

文件存儲內容為：
‘‘‘

中國:北京:東城,西城,大興,房山:上海:靜安,普陀,浦東,金山:廣州:天河,越秀,海珠,白雲:香港:九龍,北區,大浦,沙田
美國:華盛頓:白宮
俄羅斯:莫斯科:沙皇
‘‘‘

文件內容轉換多層字典（適合新手理解）