要求

1.可以一層一層的進入到所有層
2.可以在每一層返回上一層
3.可以在任意層退回主菜單

'''^....0^ .1 ^1^.. 011.^ 1.0^ 1 ^ ^0.11 ^ ^..^0. ^ 0^.0 1 .^.1 ^0 .........001^.1 1. .111100....01^00 11^ ^1. .1^1.^ ^0 0^.^ ^0..1.1 1..^1 .0 ^ ^00. ^^0.^^ 0 ^^110.^0 0 ^ ^^^10.01^^ 10 1 1 ^^^1110.101 10 1.1 ^^^1111110010 01 ^^ ^^^1111^1.^ ^^^10 10^ 0^ 1 ^^111^^^0.1^ 1....^11 0 ^^11^^^ 0.. ....1^ ^ ^1. 0^ ^11^^^ ^ 1 111^ ^ 0.10 00 11 ^^^^^ 1 0 1.0^ ^0 ^0 ^^^^ 0 0.0^ 1.0 .^ ^^^^ 1 1 .0^.^ ^^ 0^ ^1 ^^^^ 0. ^.11 ^ 11 1. ^^^ ^ ^ ..^^..^ ^1 ^.^ ^^^ .0 ^.00..^ ^0 01 ^^^ .. 0..^1 .. .1 ^.^ ^^^ 1 ^ ^0001^ 1. 00 0. ^^^ ^.0 ^.1. 0^. ^.^ ^.^ ^^^ ..0.01 .^^. .^ 1001 ^^ ^^^ . 1^. ^ ^. 11 0. 1 ^ ^^ 0.0 ^. 0 ^0 1 ^^^ 0.0.^ 1. 0^ 0 .1 ^^^ ...1 1. 00 . .1 ^^^ ..1 1. ^. 0 .^ ^^ ..0. 1. .^ . 0 ..1 1. 01 . . ^ 0^.^ 00 ^0 1. ^ 1 1.0 00 . ^^^^^^ ..^ 00 01 ..1. 00 10 1 ^^.1 00 ^. ^^^ .1.. 00 .1 1..01 ..1.1 00 1. ..^ 10^ 1^ 00 ^.1 0 1 1.1 00 00 ^ 1 ^. 00 ^.^ 10^ ^^1.1 00 00 10^..^ 1. ^. 1.0 1 ^. 00 00 .^^ ^. ^ 1 00 ^0000^ ^ 011 0 ^. 00.0^ ^00000 1.00.1 11. 1 0 1^^0.01 ^^^ 01.^ ^ 1 1^^ ^.^1 1 0... 1 ^1 1^ ^ .01 ^ 1.. 1.1 ^0.0^ 0 1..01^^100000..0^1 1 ^ 1 ^^1111^ ^^0 ^ ^ 1 1000^.1 ^.^ . 00.. 1.1 0. 01. . 1. .^1. 1 1. ^0^ . ^.1 00 01^.0 001. .^My dear Max said： "I like you, So the first bunch of sunshine I saw in the morning is you, The first gentle breeze that passed through my ear is you, The first star I see is also you. The world I see is all your shadow."FIGHTING FOR OUR FUTURE！！！ ''' # -*- coding: utf-8 -*- # @ Time : 2019-8-2 13:04 # @ Author : Alex VB # @ FileName: python_learn——Level 3 menu.py # @ Software: PyCharm # @ Blog ：https://blog.csdn.net/weixin_43336281menu = {"東北" : {"黑龍江" : {},"吉林" : {},"遼寧" : {},},"華東" : {"上海":{},"江蘇":{},"浙江":{},"安徽":{},"福建":{},"江西":{},"山東":{"濟南":{},"青島":{},"淄博":{},"棗莊":{},"東營":{},"煙臺":{},"濰坊":{},"濟寧":{},"泰安":{},"威海":{},"日照":{},"濱州":{},"德州":{},"聊城":{},"臨沂":{},"菏澤":{}},"臺灣":{},},"華北" : {"北京":{},"天津":{"和平":{},"河東":{},"河西":{},"南開":{},"河北":{},"紅橋":{},"濱海新":{},"東麗":{},"西青":{},"津南":{},"北辰":{},"武清":{},"寶坻":{},"寧河":{},"靜海":{},"薊州":{},},"山西":{},"河北":{},"內蒙古":{},},"華中" : {"河南":{"鄭州":{},"開封":{},"洛陽":{},"平頂山":{},"安陽":{},"鶴壁":{},"新鄉":{},"焦作":{},"濮陽":{},"許昌":{},"漯河":{},"三門峽":{},"南陽":{},"商丘":{},"信陽":{},"周口":{},"駐馬店":{}},"湖北":{},"湖南":{},},"華南" : {"廣東":{},"廣西":{},"海南":{},"香港":{},"澳門":{},},"西南" : {"四川":{},"貴州":{},"云南":{},"重慶":{},"西藏":{},},"西北" : {"陜西":{},"甘肅":{},"青海":{},"寧夏":{},"新疆":{},}, }Current_Layer = menu #實現動態循環 Parent_Layers = [] #保留所有父級while True:for key in Current_Layer:print(key)choice = input(">>> ").strip()if len(choice) == 0 : continueif choice in Current_Layer:Parent_Layers.append(Current_Layer) #在進入下一層之前，把當前層加入到父級中Current_Layer = Current_Layer[choice] #改變當前層elif choice == 'back':if Parent_Layers:Current_Layer = Parent_Layers.pop() #取出父級列表中的最后一個值else:print("nothing……")

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