Simple exercise: Python Level three menu optimizer

1menu = {2     'Beijing':{3         'Haidian':{4             'Five crossing':{5                 'Soho':{},6                 'NetEase':{},7                 'Google':{}8             },9             'Zhongguancun':{Ten                 'Iqiyi Art':{}, One                 'Autohome':{}, A                 'Youku':{}, -             }, -             'on the ground':{ the                 'Baidu':{}, -             }, -         }, -         'changping':{ +             'Shahe':{ -                 'Beihang University':{}, +             }, A             'Tin Tong Court':{}, at             'Huilongguan':{}, -         }, -         'Chaoyang':{}, -         'Dongcheng':{}, -     }, -     'Shanghai':{ in         'Minhang':{ -             "People's square":{ to                 'Fried Chicken Shop':{} +             } -         }, the         'Zhabei':{ *             'Train Warfare':{ $                 'Ctrip':{}Panax Notoginseng             } -         }, the         'Pudong':{}, +     }, A     'Shandong':{}, the}

The code is as follows:

1Current_layer=menu#Current Layer2Last_layers=[menu]#up a layer3  whileTrue:4      forKeyinchCurrent_layer:#Print the first level menu5         Print(Key)6Choice=input (">>:"). Strip ()#Select the second level menu7     ifChoiceinchCurrent_layer:8Last_layers.append (Current_layer)#Add the current layer menu to the previous menu before entering the next level menu9Current_layer=current_layer[choice]#The current layer menu is redefined and enters the loop to print the next level menuTen     ifChoice==0:#Select menu layer is empty, end this loop One         Continue A     ifchoice=="Q":#Select the menu layer as "Q" to end this layer loop -          Break -     ifchoice=="b":#Select the menu layer as "B" to return to the previous level menu theCURRENT_LAYER=LAST_LAYERS[-1]#The current layer is redefined before returning to the previous layer menu -Last_layers.pop ()#deletes the last layer of list data added to the next level of menu entry - Print("The program is over! ") -  　　 

Simple exercise: Python Level three menu optimizer