[Terry Notes] python Level 3 menu,

[Terry Notes] python Level 3 menu,

Output the Level 3 menu, select it, and display it layer by layer. "B" returns to the level 1 menu.

1 menu = {2 'beijing': {3 'haidian ': {4 'wudaokou': {5 'soho ': {}, 6 'netease ':{}, 7 'Google ': {} 8}, 9 'zhongguancun': {10 'iqiyi ':{}, 11 'car home' :{}, 12 'youku ':{}, 13}, 14' ': {15 'Baidu': {}, 16}, 17}, 18 'changping ': {19 'shahe': {20 'old boys ': {}, 21 'beihang ':{}, 22}, 23 'tiantongyuan' :{}, 24 'longguan ':{}, 25}, 26 'chaoyang ': {}, 27 'dongcheng ':{}, 28}, 29 'shanghai': {30 'minhang': {31 "People's Square": {32 'chicken shops ': {} 33} 34}, 35 'zhabei ': {36 'train barri': {37 'ctrip': {} 38} 39}, 40 'pudong ':{}, 41}, 42 'shandong ': {}, 43}

 

Second force youth edition:

 1 while True: 2     for key in menu: 3         print(key) 4     choice = input(">>>:") 5     if len(choice) == 0: continue 6     if choice not in menu:continue 7     while True: 8         for key2 in menu[choice]: 9             print(key2)10         choice2 = input(">>>:")11         if len(choice2) == 0: continue12         if choice2 == "b": break13         if choice2 not in menu[choice]: continue14         while True:15             for key3 in menu[choice][choice2]:16                 print(key3)17             choice3 = input(">>>:")18             if len(choice3) == 0: continue19             if choice3 == "b": break20             if choice3 not in menu[choice][choice2]: continue21             while True:22                 for key4 in menu[choice][choice2][choice3]:23                     print(key4)24                 choice4 = input(">>>:")25                 if len(choice4) == 0: continue26                 if choice4 == "b": break27                 if choice4 not in menu[choice][choice2][choice3]: continue

 

Youth edition:

 1 current_level = menu 2 last_level = [] 3 while True: 4     for key in current_level: 5         print(key) 6     choice = input(">>>:") 7     if len(choice) == 0:continue 8     if choice == "b": 9         if not last_level : break10         current_level = last_level[-1]11         last_level.pop()12     if choice not in current_level:continue13     last_level.append(current_level)14     current_level = current_level[choice]