Python job: Level 3 menu (Week 1 ),

Python job: Level 3 menu (Week 1 ),

I. Job Requirements:

1. Run the program to output the first menu

2. Select a level-1 menu and output level-2 menus. Similarly, level-3 menus are output.

3. Save menu data in a file

4. Ask the user to select whether to exit

5. The function of returning the top menu

 

Ii. Third-level menu reading file content:

{'Beijing': {"Changping": {"shahe": ["oldboy", "test"], "tiantongyuan": ["chain home property ", "I love my family"]}, "Chaoyang": {"Wangjing": ["Benz", "momo"], "International trade": {"CICC", "HP "}, "Dongzhimen": {"Advent", "Feixin" },}, "Haidian" :{},}, 'shandong ': {"Dezhou ":{}, "Qingdao" :{}, "Jinan" :{}}, 'guangdong ': {"Dongguan" :{}, "Changshu" :{}, "Foshan ": {},},}

3. flowchart:

 

Iv. Code: (python3.6)

#! /Usr/bin/env python #-*-coding: UTF-8-*-# Author: Evenimport sysfile = open ("third-level menu text content", 'R ', encoding = 'utf-8') # Open Level 3 menu text file f = file. read () for line in f: # read the information of each row in the file file_str = str (f) # convert the information of each row to the string format data = eval (file_str) # converting a string to a dictionary format def list (): # define to read the key for I in data: print (I) def choose1 (choice1) in the dictionary: # define the first layer to select while choice1! = 'Q': # if the input is q, exit the program global one = choice1 # define the global variable one so that other functions can call if choice1 in data: for i2 in data [one]: print ("\ t", i2) # display the second-level information choose2 (input ("Please input second-level:") selected in level 3 menu :")) # Call the choose2 function and enter the second-level information break elif choice1 = 'B': # Enter B to exit the loop break else: error = input ("input error. Please enter the first layer again: ") # if error = 'q': # Enter q to exit the program sys. exit () else: # Otherwise, call this function choose1 (error) else: sys. exit () def choose2 (choice2): # define Select while choice2 on the second layer! = 'Q': global two = choice2 # defines the global variable two so that other functions can call if choice2 in data [one]: for i3 in data [one] [two]: print ("\ t", i3) # display choose3 (input ("Enter Layer 3:") in level 3 menu :")) # Call the choose3 function and enter the Level 3 Information break elif choice2 = 'B': # Enter B to return to the level 1 list () # Call the list function to display the first layer of Information choose1 (input ("Enter the first layer:") break else: error2 = input ("input error, Please re-enter the second layer :") # input error. re-enter if error2 = 'q': # Enter q to exit the program sys. exit () else: choose2 (error2) # Call this function else: sys. exit () def choose3 (choice3): # define the Layer 3 select while choice3! = 'Q': global three = choice3 # defines the global variable three so that other functions can call if choice3 in data [one] [two]: for i4 in data [one] [two] [three]: print ("\ t", i4) # display the layer-4 Information choose4 (input ("the last layer, return to the previous layer, press 'B', exit, press 'q") selected in the level-3 menu ")) # Call the choose4 function and prompt to exit or return break elif choice3 = 'B': # Enter B to exit choose1 (one) break else: error3 = input ("input error, please re-enter Layer 3: ") # input error. You can re-enter q and exit if error3 = 'q': sys. exit () else: choose3 (error3) # Call this function e Lse: sys. exit () def choose4 (choice4): # define the final exit while choice4! = 'Q': # input q to exit if choice4 = 'B': # input B to return to the previous choose2 (two) else: choose4 (input ("is the last layer, to return to the previous layer, press 'B'. to exit, press 'q'.) # declare to end else: sys. exit () print ("exit press 'Q', return to superior menu press 'B'") # declare function list () # Call the list function to display the first layer of Information choose1 (input ("Enter the first layer:") # main program to start running

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