old_contents: # Transposition Cipher Test
  # https://www.nostarch.com/crackingcodes/ (BSD Licensed)
  
  import random, sys, transpositionEncrypt, transpositionDecrypt
  
  def main():
      random.seed(42)  #  Set the random "seed" to a static value.
  
      for i in range(20):  # Run 20 tests.
          # Generate random messages to test.
  
          # The message will have a random length:
          message = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' * random.randint(4, 40)
  
          # Convert the message string to a list to shuffle it:
          message = list(message)
          random.shuffle(message)
          message = ''.join(message)  # Convert the list back to a string.
  
          print('Test #%s: %s..."' % (i + 1, message[:50]))
  
          # Check all possible keys for each message:
          for key in range(1, int(len(message)/2)):
              encrypted = transpositionEncrypt.encryptMessage(key, message)
              decrypted = transpositionDecrypt.decryptMessage(key, encrypted)
  
              # If the decryption doesn't match the original message, display
              # an error message and quit:
              if message != decrypted:
                  print('Mismatch with key %s and message %s.' % (key, message))
                  print('Decrypted as: ' + decrypted)
                  sys.exit()
  
      print('Transposition cipher test passed.')
  
  
  # If transpositionTest.py is run (instead of imported as a module) call
  # the main() function:
  if __name__ == '__main__':
      main()
  
new_contents: # Transposition Cipher Test
  # https://www.nostarch.com/crackingcodes/ (BSD Licensed)
  
  import random, sys
  from books.CrackingCodesWithPython.Chapter07.transpositionEncrypt import encryptMessage
  from books.CrackingCodesWithPython.Chapter08.transpositionDecrypt import decryptMessage
  
  
  def main():
      random.seed(42)  # Set the random "seed" to a static value.
  
      for i in range(20):  # Run 20 tests.
          # Generate random messages to test.
  
          # The message will have a random length:
          message = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' * random.randint(4, 40)
  
          # Convert the message string to a list to shuffle it:
          message = list(message)
          random.shuffle(message)
          message = ''.join(message)  # Convert the list back to a string.
  
          print('Test #%s: %s..."' % (i + 1, message[:50]))
  
          # Check all possible keys for each message:
          for key in range(1, int(len(message)/2)):
              encrypted = encryptMessage(key, message)
              decrypted = decryptMessage(key, encrypted)
  
              # If the decryption doesn't match the original message, display
              # an error message and quit:
              if message != decrypted:
                  print('Mismatch with key %s and message %s.' % (key, message))
                  print('Decrypted as: ' + decrypted)
                  sys.exit()
  
      print('Transposition cipher test passed.')
  
  
  # If transpositionTest.py is run (instead of imported as a module) call
  # the main() function:
  if __name__ == '__main__':
      main()
  
subject: Update transpositionTest: fixed imports and PEP8 formatting