old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  # Hash starts a comment. Python will ignore anything written here.
  # The first line of the application helps the OS to figure out how to run the application (i.e. using Python)
  # The second line specifies the encoding used in this file.
  # If you still have no idea, just copy those two to your file :P
  
  #------------------------------------------------------------------------------
  # Define the main method
  #------------------------------------------------------------------------------
  def main():
  	'''The main entry of the application (i.e. The tasks should start from here)
  	'''
  	print("Hello World") # Print the text `Hello World` to the screen
  	pass # Do nothing, yes Python has a statement to do nothing :D
  
  #------------------------------------------------------------------------------
  # Check if this file is run as an application
  #------------------------------------------------------------------------------
  if __name__ == "__main__":
  	# If the condition is true, execute the main method
  	main()
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  # Hash starts a comment. Python will ignore anything written here.
  # The first line of the application helps the OS to figure out how to run the application (i.e. using Python)
  # The second line specifies the encoding used in this file.
  # If you still have no idea, just copy those two to your file :P
  # To run this file, you can try:
  # python helloworld.py
  # ./helloworld.py
  
  
  #------------------------------------------------------------------------------
  # Define the main method
  #------------------------------------------------------------------------------
  def main():
  	'''The main entry of the application (i.e. The tasks should start from here)
  	'''
  	print("Hello World") # Print the text `Hello World` to the screen
  	pass # Do nothing, yes Python has a statement to do nothing :D
  
  #------------------------------------------------------------------------------
  # Check if this file is run as an application
  #------------------------------------------------------------------------------
  if __name__ == "__main__":
  	# If the condition is true, execute the main method
  	main()
  
subject: Add helloworld demo