python实现一个三级菜单

要求

1.可以一层一层的进入到所有层
2.可以在每一层返回上一层
3.可以在任意层退回主菜单

'''^....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 = {"东北" : {"黑龙江" : {},"吉林" : {},"辽宁" : {},},"华东" : {"上海":{},"江苏":{},"浙江":{},"安徽":{},"福建":{},"江西":{},"山东":{"济南":{},"青岛":{},"淄博":{},"枣庄":{},"东营":{},"烟台":{},"潍坊":{},"济宁":{},"泰安":{},"威海":{},"日照":{},"滨州":{},"德州":{},"聊城":{},"临沂":{},"菏泽":{}},"台湾":{},},"华北" : {"北京":{},"天津":{"和平":{},"河东":{},"河西":{},"南开":{},"河北":{},"红桥":{},"滨海新":{},"东丽":{},"西青":{},"津南":{},"北辰":{},"武清":{},"宝坻":{},"宁河":{},"静海":{},"蓟州":{},},"山西":{},"河北":{},"内蒙古":{},},"华中" : {"河南":{"郑州":{},"开封":{},"洛阳":{},"平顶山":{},"安阳":{},"鹤壁":{},"新乡":{},"焦作":{},"濮阳":{},"许昌":{},"漯河":{},"三门峡":{},"南阳":{},"商丘":{},"信阳":{},"周口":{},"驻马店":{}},"湖北":{},"湖南":{},},"华南" : {"广东":{},"广西":{},"海南":{},"香港":{},"澳门":{},},"西南" : {"四川":{},"贵州":{},"云南":{},"重庆":{},"西藏":{},},"西北" : {"陕西":{},"甘肃":{},"青海":{},"宁夏":{},"新疆":{},},
}Current_Layer = menu    #实现动态循环
Parent_Layers = []  #保留所有父级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)     #在进入下一层之前，把当前层加入到父级中Current_Layer = Current_Layer[choice]   #改变当前层elif choice == 'back':if Parent_Layers:Current_Layer = Parent_Layers.pop()     #取出父级列表中的最后一个值else:print("nothing……")

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python实现一个三级菜单

要求

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