Python three-level menu instance,

Python three-level menu instance,

Requirements:

Print province, city, and county menus

Can return to the upper-level

Exit the program at any time

Version 1

# _ Author: Ahern Li # @ _ date: menu = {'zhejiang province ': {'hangzhou City': {'yuhang district ': {'zhongtai ':{}, 'fling' :{}, 'xihu district ': {'xihu' :{}, 'left' :{}}, 'wenzhou City ': {'cangnan ': {'lingxi' :{}, 'longgang ':{}}, 'ruian': {'anyang ':{}, 'jinhu ':{}}}}, 'guangdong province ': {'guangzhou City': {'yuexiu district ': {'renmin road' :{}, 'beijing': {}}, 'liwan district': {'sandup ': {}, 'longjin' :{}}, 'zhuhai City ': {'xiangzhou region': {'gongbei' :{}, 'geida ':{}}, 'Golden Bay Area ': {'hongqi Zhen' :{}, 'pingsha Zhen ':{}}}# flag q_flag = True # exit flag Q_flag = True # return, exit flag appears False exit loop while q_flag and Q_flag: # traverse Print province for I in menu: print (I) province = input ('enter the province to be searched (Q, exit ):'). strip () if province in menu: while q_flag and Q_flag: for I in menu [province]: print (I) city = input ('enter the city (q, return or Q, exit ):'). strip () if city in menu [province]: while q_flag and Q_flag: for I in menu [province] [city]: print (I) county = input ('Enter the region or county (q, return or Q, exit ):'). strip () if county in menu [province] [city]: while q_flag and Q_fla G: for I in menu [province] [city] [county]: print (I) # The last page is displayed. The input format is choice = input ('Last page! Q, return or Q, exit :'). strip () if choice = 'q': # With else: q_flag = True, exit the layer loop and return the upper loop q_flag = False elif choice = 'q ': # exit the Large Loop Q_flag = False else: # The system prompts that the input is invalid print ('input error! ') # Change the value of q_flag to exit a loop. else: q_flag = True elif county = 'q': q_flag = False 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: menu = {'zhejiang province ': {'hangzhou City': {'yuhang district ': {'zhongtai ':{}, 'fling' :{}, 'xihu district ': {'xihu' :{}, 'left' :{}}, 'wenzhou City ': {'cangnan ': {'lingxi' :{}, 'longgang ':{}}, 'ruian': {'anyang ':{}, 'jinhu ':{}}}}, 'guangdong province ': {'guangzhou City': {'yuexiu district ': {'renmin road' :{}, 'beijing': {}}, 'liwan district': {'sandup ': {}, 'longjin' :{}}, 'zhuhai City ': {'xiangzhou region': {'gongbei' :{}, 'geida ':{}}, 'Golden Bay Area ': {'hongqi Zhen' :{}, 'pingsha Zhen ':{}}}current_layer = menu # Implement Dynamic Loop parent_layer = [] # retain all parent layers, the last element is always the parent layer while True: print ()# Print (I) choice = input ('Enter the query address \ n >>> :'). strip () if choice in current_layer: if current_layer [choice]: # determine whether it is the last layer parent_layer.append (current_layer) # before entering the child layer, add the current layer as the parent layer current_layer = current_layer [choice] # modify the child layer else: print ('current is the last page') elif choice = '': continue elif choice = 'q': # Return the upper layer if parent_layer: # determine whether parent_layer is null current_layer = parent_lay Er. pop () # retrieve the parent layer of the current layer # exit loop elif choice = 'q': break else: print ('input error! ')

The above example of the Python three-level menu is all the content shared by xiaobian. I hope to give you a reference, and hope you can support the help house.