import pygame, sys
from pygame.locals import *

pygame.init()

#FPS = 30 # frames per second setting
#fpsClock = pygame.time.Clock()

# set up the window
screen = pygame.display.set_mode((800, 64), 0, 32)
pygame.display.set_caption('Animation')

WHITE = (255, 255, 255)
circleImg = pygame.image.load('circle64.png')
circlex = circley = 0
dir = 1

while True: # the main game loop
    screen.fill(WHITE)

    circlex = circlex + dir
    if circlex > 736 or circlex < 0:
        dir = -1 * dir
 
    screen.blit(circleImg, (circlex, circley))

    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    pygame.display.update()
#    fpsClock.tick(FPS)