pythondone_关于python的一个问题

python2.7&＃xff0c;与小卡特一起学python&＃xff0c;在18章写python乒乓球的程序时&＃xff0c;为什么键盘、鼠标都没有动作&＃xff0c;球就不会运动&＃xff0c;感觉是主循环没有走完&＃xff0c;卡在那里&＃xff0c;请大神来解答。

主循环代码&＃xff1a;

pygame.init()

screen &＃61; pygame.display.set_mode([640,480])

background &＃61; pygame.Surface(screen.get_size() )

background.fill([255, 255, 255])

clock &＃61; pygame.time.Clock()

myBall &＃61; MyBallClass(&＃39;wackyball.png&＃39;, [10, 5], [50, 50])

ballGroup &＃61; pygame.sprite.Group(myBall)

paddle &＃61; MyPaddleClass([270, 400])

lives &＃61; 3

score &＃61; 0

score_font &＃61; pygame.font.Font(None, 50)

score_surf &＃61; score_font.render(str(score),1,[0,0,0])

score_pos &＃61; [10, 10]

pygame.key.set_repeat(100, 50)

done &＃61; False

running &＃61; True

while running:

screen.blit(background, (0,0))

for event in pygame.event.get():

if not done:

screen.blit(myBall.image, myBall.rect)

screen.blit(paddle.image, paddle.rect)

screen.blit(score_surf, score_pos)

for i in range (lives):

width &＃61; screen.get_rect().width

screen.blit(myBall.image, [width - 40 * i, 20])

pygame.display.flip()

if event.type &＃61;&＃61; pygame.QUIT:

running &＃61; False

elif event.type &＃61;&＃61; pygame.KEYDOWN:

paddle.move()

if pygame.sprite.spritecollide(paddle, ballGroup, False):

myBall.speed[1] &＃61; -myBall.speed[1]

myBall.move()

if myBall.rect.top >&＃61; screen.get_rect().bottom:

lives &＃61; lives - 1

if lives &＃61;&＃61; 0:

final_text1 &＃61; "Game Over"

final_text2 &＃61; "Your final score is: " &＃43; str(score)

ft1_font &＃61; pygame.font.Font(None, 70)

ft1_surf &＃61; ft1_font.render(final_text1, 1, (0,0,0))

ft2_font &＃61; pygame.font.Font(None, 50)

ft2_surf &＃61; ft2_font.render(final_text2, 1, (0,0,0))

screen.blit(ft1_surf, [screen.get_width()/2 - \

ft1_surf.get_width()/2, 100])

screen.blit(ft2_surf, [screen.get_width()/2 - \

ft1_surf.get_width()/2, 200])

pygame.display.flip()

done &＃61; True

else:

pygame.time.delay(2000)

myBall.rect.topleft &＃61; [(screen.get_rect().width) - 40 * lives, 20]

clock.tick(30)

pygame.quit()