Python Instance 3-level three menu

Old Boys Training and study:

1 " "2 AUTHOR:RANXF3 " "4menu = {5     'Beijing': {6         'Haidian': {7             'Five crossing': {8                 'Soho': {},9                 'NetEase': {},Ten                 'Google': {} One             }, A             'Zhongguancun': { -                 'Iqiyi Art': {}, -                 'Autohome': {}, the                 'Youku': {}, -             }, -             'on the ground': { -                 'Baidu': {}, +             }, -         }, +         'changping': { A             'Shahe': { at                 'old boy': {}, -                 'Beihang University': {}, -             }, -             'Tin Tong Court': {}, -             'Huilongguan': {}, -         }, in         'Chaoyang': {}, -         'Dongcheng': {}, to     }, +     'Shanghai': { -         'Minhang': { the             "People's square": { *                 'Fried Chicken Shop': {} $             }Panax Notoginseng         }, -         'Zhabei': { the             'Train Warfare': { +                 'Ctrip': {} A             } the         }, +         'Pudong': {}, -     }, $     'Shandong': {}, $ } -Exit_flag =False -  the  while  notExit_flag: -      forI1inchMenu:Wuyi         Print(I1) the  -Choice1 = input (">>> Select a menu 1>>>:") Wu     ifChoice1inchMenu: -          while  notExit_flag: About              forI2inchMenu[choice1]: $                 Print("\ t", I2) -  -Choice2 = input (">>> Select Level Two menu 2>>>:") -             ifChoice2inchMenu[choice1]: A                  while  notExit_flag: +                      fori3inchMenu[choice1][choice2]: the                         Print("\t\t", i3) -  $Choice3 = input (">>> Select level Three menu 3>>>:") the                     ifChoice3inchMenu[choice1][choice2]: the                          forI4inchMenu[choice1][choice2][choice3]: the                             Print("\t\t", I4) theChoice4 = input (">>> last level menu, press B to return, press Q to exit >>>:") -                         ifChoice4 = ='b': in                             Pass the                         elifChoice1 = ='Q': theExit_flag =True About  the                     ifChoice3 = ='b': the                          Break the                     elifChoice3 = ='Q': +Exit_flag =True -  the             ifChoice2 = ='b':Bayi                  Break the             elifChoice2 = ='Q': theExit_flag =True -     ifChoice1 = ='b': -          Break the     elifChoice1 = ='Q': theExit_flag = True

Python Instance 3-level three menu