import pygame



def run_game():
    
    ## Initialize the pygame submodules and set up the display window.

    pygame.init()

    width = 640
    height = 480
    my_win = pygame.display.set_mode((width,height))


    ## The game loop starts here.

    keepGoing = True    
    while (keepGoing):

        ## Handle events.

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                keepGoing = False

        ## Draw picture and update display

        my_win.fill(pygame.color.Color("black"))

        pygame.draw.circle(my_win, pygame.color.Color('navy'), (500,250),75)

        pygame.display.update()

    ## The game loop ends here.

    pygame.quit()


## Call the function run_game.

run_game()