old_contents: # Transposition Cipher Encrypt/Decrypt File
  # https://www.nostarch.com/crackingcodes/ (BSD Licensed)
  
  import time
  import os
  import sys
  from books.CrackingCodesWithPython.Chapter07.transpositionEncrypt import encryptMessage
  from books.CrackingCodesWithPython.Chapter08.transpositionDecrypt import decryptMessage
  
  
  def main():
      inputFilename = 'frankenstein.txt'
      # BE CAREFUL! If a file with the outputFilename name already exists,
      # this program will overwrite that file:
      outputFilename = 'frankenstein.encrypted.txt'
      myKey = 10
      myMode = 'encrypt' # Set to 'encrypt' or 'decrypt'
  
      # If the input file does not exist, the program terminates early:
      if not os.path.exists(inputFilename):
          print('The file %s does not exist. Quitting...' % inputFilename)
          sys.exit()
  
      # If the output file already exists, give the user a chance to quit:
      if os.path.exists(outputFilename):
          print('This will overwrite the file %s. (C)ontinue or (Q)uit?' % outputFilename)
          response = input('> ')
          if not response.lower().startswith('c'):
              sys.exit()
  
      # Read in the message from the input file:
      fileObj = open(inputFilename)
      content = fileObj.read()
      fileObj.close()
  
      print('%sing...' % (myMode.title()))
  
      # Measure how long the encryption/decryption takes:
      startTime = time.time()
      if myMode == 'encrypt':
          translated = encryptMessage(myKey, content)
      elif myMode == 'decrypt':
          translated = decryptMessage(myKey, content)
      totalTime = round(time.time() - startTime, 2)
      print('%sion time: %s seconds' % (myMode.title(), totalTime))
  
      # Write out the translated message to the output file:
      outputFileObj = open(outputFilename, 'w')
      outputFileObj.write(translated)
      outputFileObj.close()
  
      print('Done %sing %s (%s characters).' % (myMode, inputFilename, len(content)))
      print('%sed file is %s.' % (myMode.title(), outputFilename))
  
  
  # If transpositionCipherFile.py is run (instead of imported as a module),
  # call the main() function:
  if __name__ == '__main__':
      main()
  
new_contents: # Transposition Cipher Encrypt/Decrypt File
  # https://www.nostarch.com/crackingcodes/ (BSD Licensed)
  
  import time
  import os
  import sys
  from books.CrackingCodesWithPython.Chapter07.transpositionEncrypt import encryptMessage
  from books.CrackingCodesWithPython.Chapter08.transpositionDecrypt import decryptMessage
  
  
  def main():
      inputFilename = 'frankenstein.txt'
      # BE CAREFUL! If a file with the outputFilename name already exists,
      # this program will overwrite that file:
      outputFilename = 'frankenstein.encrypted.txt'
      myKey = 10
      myMode = 'encrypt'  # Set to 'encrypt' or 'decrypt'
  
      # If the input file does not exist, the program terminates early:
      if not os.path.exists(inputFilename):
          print('The file %s does not exist. Quitting...' % inputFilename)
          sys.exit()
  
      # If the output file already exists, give the user a chance to quit:
      if os.path.exists(outputFilename):
          print('This will overwrite the file %s. (C)ontinue or (Q)uit?' % outputFilename)
          response = input('> ')
          if not response.lower().startswith('c'):
              sys.exit()
  
      # Read in the message from the input file:
      fileObj = open(inputFilename)
      content = fileObj.read()
      fileObj.close()
  
      print('%sing...' % (myMode.title()))
  
      # Measure how long the encryption/decryption takes:
      startTime = time.time()
      if myMode == 'encrypt':
          translated = encryptMessage(myKey, content)
      elif myMode == 'decrypt':
          translated = decryptMessage(myKey, content)
      totalTime = round(time.time() - startTime, 2)
      print('%sion time: %s seconds' % (myMode.title(), totalTime))
  
      # Write out the translated message to the output file:
      outputFileObj = open(outputFilename, 'w')
      outputFileObj.write(translated)
      outputFileObj.close()
  
      print('Done %sing %s (%s characters).' % (myMode, inputFilename, len(content)))
      print('%sed file is %s.' % (myMode.title(), outputFilename))
  
  
  # If transpositionCipherFile.py is run (instead of imported as a module),
  # call the main() function:
  if __name__ == '__main__':
      main()
  
subject: Update transpositionFileCipher: fixed PEP8 spacing