python让女友照片飞来飞去

import pygame,sys

pygame.init()
size = width,height = [1200,800]
speed = [1,1]
BLACK = 0,0,0
screen = pygame.display.set_mode(size)
#游戏名称
pygame.display.set_caption("pygame壁球")
#导入女友的图片路径，可自定义
ball = pygame.image.load("3.jpg")
ball = pygame.transform.scale(ball, (150, 135))
ballrect = ball.get_rect()

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
    #移动方式
    ballrect = ballrect.move(speed[0],speed[1])
    if ballrect.left < 0 or ballrect.right > width:
        speed[0] = -speed[0]
    if ballrect.top < 0 or ballrect.bottom > height:
        speed[1] = -speed[1]

    #背景颜色
    screen.fill(BLACK)
    screen.blit(ball,ballrect)
    #刷新
    pygame.display.update()