old_contents: from flask import Flask
  import socket
  
  
  app = Flask(__name__)
  
  
  @app.route("/")
  def index():
      return "Hello from FLASK. My Hostname is: %s \n" % (socket.gethostname())
  
  if __name__ == "__main__":
      app.run(host='0.0.0.0', port="7000")
  
new_contents: from flask import Flask
  import socket
  
  
  app = Flask(__name__)
  
  
  @app.route("/")
  def index():
      return "Hello from FLASK. My Hostname is: %s \n" % (socket.gethostname())
  
  if __name__ == "__main__":
      app.run(host='0.0.0.0', port="5000")
  
subject: Update app.py