new_contents: #!/usr/bin/env python
  
  class WhaleWatcher:
      def __init__(self):
  
      def main(self):
  
      def run(self):
  
      def stop(self):
  
      def clean_up(self):
  
  if __name__ == '__main__':
      watcher = WhaleWatcher()
      watcher.main()
  
subject: create class structure