import csv import sys #The password list - We start with it populated for testing purposes passwords = [["yahoo","XqffoZeo"],["google","CoIushujSetu"]] #The password file name to store the passwords to passwordFileName = "samplePasswordFile"  #The encryption key for the caesar cypher encryptionKey=16 #Caesar Cypher Encryption def passwordEncrypt (unencryptedMessage, key): #We will start with an empty string as our encryptedMessage  encryptedMessage = ''  #For each symbol in the unencryptedMessage we will add an encrypted symbol into the encryptedMessage  for symbol in unencryptedMessage: if symbol.isalpha(): num = ord(symbol) num += key if symbol.isupper(): if num > ord('Z'): num -= 26 elif num < ord('A'): num += 26 elif symbol.islower(): if num > ord('z'): num -= 26 elif num < ord('a'): num += 26 encryptedMessage += chr(num) else: encryptedMessage += symbol return encryptedMessage def loadPasswordFile(fileName): with open(fileName, newline='') as csvfile: passwordreader = csv.reader(csvfile) passwordList = list(passwordreader) return passwordList def savePasswordFile(passwordList, fileName): with open(fileName, 'w+', newline='') as csvfile: passwordwriter = csv.writer(csvfile) passwordwriter.writerows(passwordList) while True: print("What would you like to do:") print(" 1. Open password file") print(" 2. Lookup a password") print(" 3. Add a password") print(" 4. Save password file") print(" 5. Print the encrypted password list (for testing)") print(" 6. Quit program") print("Please enter a number (1-4)") choice = input() if(choice == '1'): #Load the password list from a file  passwords = loadPasswordFile(passwordFileName) if(choice == '2'): #Lookup at password  print("Which website do you want to lookup the password for?") for keyvalue in passwords: print(keyvalue[0]) passwordToLookup = input() ####### YOUR CODE HERE ######  #You will need to find the password that matches the website  #You will then need to decrypt the password  #  #1. Create a loop that goes through each item in the password list  # You can consult https://champlain.instructure.com/courses/486659/pages/working-with-lists?module_item_id=8842667  # simplest way to loop through a list is: for i in range(len(NAMEOFLIST))  #  #2. Check if the name is found. To index a list of lists you use 2 square backet sets  # So passwords[0][1] would mean for the first item in the list get it's 2nd item (remember, lists start at 0)  # So this would be 'XqffoZeo' in the password list given what is predefined at the top of the page.  # If you created a loop using the syntax described in step 1, then i is your 'iterator' in the list so you  # will want to use i in your first set of brackets.  #  #3. If the name is found then decrypt it. Decrypting is that exact reverse operation from encrypting. Take a look at the  # caesar cypher lecture as a reference. You do not need to write your own decryption function, you can reuse passwordEncrypt  #  # Write the above one step at a time. By this I mean, write step 1... but in your loop print out every item in the list  # for testing purposes. Then write step 2, and print out the password but not decrypted. Then write step 3. This way  # you can test easily along the way.  #  ####### YOUR CODE HERE ######  if(choice == '3'): print("What website is this password for?") website = input() print("What is the password?") unencryptedPassword = input() ####### YOUR CODE HERE ######  #You will need to encrypt the password and store it in the list of passwords  #The encryption function is already written for you  #Step 1: You can say encryptedPassword = passwordEncrypt(unencryptedPassword,encryptionKey)]  #the encryptionKey variable is defined already as 16, don't change this  #Step 2: create a list of size 2, first item the website name and the second item the password.  #Step 3: append the list from Step 2 to the password list  ####### YOUR CODE HERE ######  if(choice == '4'): #Save the passwords to a file  savePasswordFile(passwords,passwordFileName) if(choice == '5'): #print out the password list  for keyvalue in passwords: print(', '.join(keyvalue)) if(choice == '6'): #quit our program  sys.exit()