old_contents: from flask import Flask
  app = Flask(__name__)
  
  @app.route("/")
  def hello():
      return "Hello World!"
  
  if __name__ == "__main__":
      app.run(host='0.0.0.0', port=8080)
new_contents: /*
  
  FILE NAME
  hello.py
  
  1. WHAT IT DOES
  Tests a new Flask installation.
   
  2. REQUIRES
  * Any Raspberry Pi
  
  3. ORIGINAL WORK
  Raspberry Full stack 2015, Peter Dalmaris
  
  4. HARDWARE
  None
  
  5. SOFTWARE
  Command line terminal
  Simple text editor
  Libraries:
  from flask import Flask
  
  6. WARNING!
  None
  
  7. CREATED 
  
  8. TYPICAL OUTPUT
  A simple web page served by this flask application in the user's browser.
  
   // 9. COMMENTS
  --
  
   // 10. END
  
  */
  
  
  from flask import Flask
  app = Flask(__name__)
  
  @app.route("/")
  def hello():
      return "Hello World!"
  
  if __name__ == "__main__":
      app.run(host='0.0.0.0', port=8080)
  
subject: Update hello.py