bounce.py

import sys, pygame
pygame.init()

size = width, height = 600, 600
speed = [1, 1]
red = 130, 202, 154

screen = pygame.display.set_mode(size)


# ball = pygame.image.load("pygame_logo.gif")
ball = pygame.image.load("TechEmDogKoa1.jpg")
ballrect = ball.get_rect()

while 1:
    for event in pygame.event.get():
        if event.type == pygame.QUIT: sys.exit()

    ballrect = ballrect.move(speed)
    if ballrect.left < 0 or ballrect.right > width:
        speed[0] = -speed[0]
    if ballrect.top < 0 or ballrect.bottom > height:
        speed[1] = -speed[1]

    screen.fill(red)
    screen.blit(ball, ballrect)
    pygame.display.flip()