old_contents: from app import app
  import os
  
  port = int(os.environ.get('PORT', 8000))
  app.run(host='0.0.0.0',port=port, debug=False)
  
new_contents: from app import app
  import os
  
  port = int(os.environ.get('PORT', 8000))
  
  if __name__ == '__main__':
      app.run(host='0.0.0.0',port=port, debug=debug_flag)
  
subject: Fix unicorn heroku bug