Create a pyGame window with a blue background

import pygame
# The import module pygame
pygame.init()
# Call function pygame.init Initialize background settings .
screen = pygame.display.set_mode((800,600))
# Call function pygame.display.set_mode, Enter the pixels that define the width and height of the game window . Assign this to screen.
screen.fill((0,0,255))
# use RGB Value as the fill background color .
pygame.display.flip()
# Make the recently drawn screen visible .