Python Three-level menu instance detailed

Here is an example of a Python level three menu for everyone. Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a look at it with a little knitting.

Requirements:

Print provincial, city, and county level three menus

Can return to the upper level

Can exit the program at any time

Version 1

# _author:ahern li# @_date:2017/9/12menu = {' Zhejiang province ': {' Hangzhou ': {' Yuhang ': {' Zhongtai ': {}, ' Pro flat ': {}}, ' West L. District ': {' West lake ': {}, ' left      ': {}}, ' Wenzhou ': {' Cangnan ': {' Ling Xi ': {}, ' Longgang ': {}}, ' Ruian County ': {' Anyang ': {}, ' Kam Lake ': {}}}, ' Guangdong Province ': {' Guangzhou ': { ' Yuexiu District ': {' Renmin road ': {}, ' Beijing Rd ': {}}, ' Liwan District ': {' Shamian ': {}, ' Long Jin ': {}}}, ' Zhuhai ': {' Xiangzhou District ': {' arch North ': {}, ' Jida ': {}}, ' King Bay District ': {' Red Banner(marxist-leninist) Town '  : {}, ' flat sand town ': {}}}}}# return token q_flag = true# exit Tag Q_flag = true# returned, exit token appears false exit loop while Q_flag and Q_flag: # Traverse Print Province       For I in Menu:print (i) Province = input (' Please enter the province to find (Q, exit): '). Strip () if province in Menu:while Q_flag and Q_flag: For I in Menu[province]: print (i) city = input (' Enter the municipality you want to find (q, return or Q, exit): '). Strip () if Urban in MENU[PR Ovince]: While Q_flag and q_flag:for I in menu[province][city]: print (i) County = INP              UT (' Please enter the region or county you want to find (q, return or Q, exit): '). Strip () if county in menu[province][city]: while Q_flag and Q_flag: For I in menu[Province][city][county]: Print (i) # hint last page, input format choice = input (' last page! Q, return or Q, exit : '). Strip () if choice = = ' Q ': # mate Else:q_flag = True to exit the layer loop, return to upper loop Q_flag = F                Alse elif Choice = = ' Q ': # exit Cycle Q_flag = False Else:            # Prompt input illegal print (' input error! ') # change back to Q_flag value, implement only exit one layer loop Else:q_flag = True elif County = = ' Q ': Q_flag = Fals        e elif County = = ' Q ': Q_flag = False else:print (' input error! ')      Else:q_flag = True elif City = = ' Q ': Q_flag = false elif City = = ' Q ': Q_flag = False    Else:print (' Input error! ') Else:q_flag = True elif province = = ' Q ': Q_flag = False else:print (' input error! ')

Version 2

# _author:ahern li# @_date:2017/9/12menu = {' Zhejiang province ': {' Hangzhou ': {' Yuhang ': {' Zhongtai ': {}, ' Pro flat ': {}}, ' West L. District ': {' West lake ': {}, ' left      ': {}}, ' Wenzhou ': {' Cangnan ': {' Ling Xi ': {}, ' Longgang ': {}}, ' Ruian County ': {' Anyang ': {}, ' Kam Lake ': {}}}, ' Guangdong Province ': {' Guangzhou ': { ' Yuexiu District ': {' Renmin road ': {}, ' Beijing Rd ': {}}, ' Liwan District ': {' Shamian ': {}, ' Long Jin ': {}}}, ' Zhuhai ': {' Xiangzhou District ': {' arch North ': {}, ' Jida ': {}}, ' King Bay District ': {' Red Banner(marxist-leninist) Town ' : {}, ' flat sand town ': {}}}}}current_layer = menu # implements dynamic loop Parent_layer = [] # preserves all parent layers, and the last element is always parent while True:print () # is only The print beauty for I in Current_layer: # Traverse Print address prints (i) choice = input (' Please enter the query address below \n>>>: '). Strip () if choice in C Urrent_layer:if Current_layer[choice]: # To determine if the last layer Parent_layer.append (current_layer) # Before entering the child layer, add the current layer as the parent layer Curre Nt_layer = Current_layer[choice] # Modify the sub-layer Else:print (' Currently the last page ') elif choice = = ': Continue elif choice = = ' Q ': # Return to Upper if Parent_layer: # to determine if Parent_layer is empty current_layer = Parent_layer.pop () # Remove current layer Parent # exit loop Elif Ch Oice = = ' Q ': Break ELse:print (' Input error! ')