[pygame] Error On Pygame Simple Game

["RR4CLB" <chester_lab@xxxxxxxxxxxx>]

Hi!

    I am just getting started in Pygame and the simple program below dies on line 4. I suspect that the command 3D is the problem. So, is this format/syntax all wrong for learning pygame? Or is something not declared?

Simple Program:
import sys, pygame
pygame.init()

size = width, height = 320, 240
speed = [2, 2]
black = 0, 0, 0

screen = pygame.display.set_mode(size)

ball = pygame.image.load("ball.bmp")
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(black)
    screen.blit(ball, ballrect)
    pygame.display.flip()