old_contents: from flask import Flask
  
  app = Flask(__name__)
  
  @app.route('/')
  def index():
      return "It's working, yayyy"
  
  if __name__ == '__main__':
  	app.run()
  
new_contents: from flask import Flask
  
  app = Flask(__name__)
  
  @app.route('/')
  def index():
      return "It's working, yayyy"
  
  if __name__ == '__main__':
      app.run()
  
subject: Update app.py