old_contents: 
  import argparse
  
  from wp.main import WordPath
  
  
  def run(first_word, last_word):
      word_path = WordPath()
      word_path.load_word_list('tests/functional/misc/words', len(first_word))
      chain = word_path.find(first_word, last_word)
  
      print(' > '.join(chain))
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('first_word')
      parser.add_argument('last_word')
      args = parser.parse_args()
  
      run(args.first_word, args.last_word)
  
new_contents: #!/usr/bin/python
  
  import argparse
  
  from wp.main import WordPath
  
  
  def run(first_word, last_word):
      word_path = WordPath()
      word_path.load_word_list('tests/functional/misc/words', len(first_word))
      chain = word_path.find(first_word, last_word)
  
      print(' > '.join(chain))
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('first_word')
      parser.add_argument('last_word')
      args = parser.parse_args()
  
      run(args.first_word, args.last_word)
  
subject: Add shebang to main python script