Invalid Character in Identifier in Python code

I don't get at all what is wrong with this code. I don't see any invalid character. I copied this main code from a website

"""
Pygame base template for opening a window, done with functions

 Sample Python/Pygame Programs
 Simpson College Computer Science
 http://programarcadegames.com/
 http://simpson.edu/computer-science/

"""

import pygame

# The use of the main function is described in Chapter 9.

# Define some colors as global constants
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)


def main():
    ''' Main function for the game. '''
    pygame.init()

    # Set the width and height of the screen [width,height]
    size = [700, 500]
    screen = pygame.display.set_mode(size)

    pygame.display.set_caption("My Game")

    # Loop until the user clicks the close button.
    done = False

    # Used to manage how fast the screen updates
    clock = pygame.time.Clock()

    # -------- Main Program Loop -----------
    while not done:
        # ALL EVENT PROCESSING SHOULD GO BELOW THIS COMMENT
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                done = True
        # ALL EVENT PROCESSING SHOULD GO ABOVE THIS COMMENT

        # ALL GAME LOGIC SHOULD GO BELOW THIS COMMENT

        # ALL GAME LOGIC SHOULD GO ABOVE THIS COMMENT

        # ALL CODE TO DRAW SHOULD GO BELOW THIS COMMENT

        # First, clear the screen to white. Don't put other drawing    
        # above this, or they will be erased with this command.
        screen.fill(WHITE)

        # ALL CODE TO DRAW SHOULD GO ABOVE THIS COMMENT

        # Go ahead and update the screen with what we've drawn.
        pygame.display.flip()

        # Limit to 60 frames per second
        clock.tick(60)

    # Close the window and quit.
    # If you forget this line, the program will 'hang'
    # on exit if running from IDLE.
    pygame.quit()

if __name__ == "__main__":
    main()

BTW the error is this

Invalid Identifier 
python.quit()
      ^

What I have tried is changing the comments but to no avail, removing pygame.quit() to no avail.