old_contents: from flask import Flask
  
  from blueprints import ping
  
  app = Flask(__name__)
  
  if __name__ == '__main__':
      app.register_blueprint(ping)
      app.run(host='0.0.0.0', port=8080, debug=True)
  
new_contents: from flask import Flask
  
  from blueprints import ping
  
  app = Flask(__name__)
  
  if __name__ == '__main__':
      app.register_blueprint(ping)
      app.run(debug=True)
  
subject: Add heroku deployment