pygame问题

flyps

我在制作游戏时调用了下文的say函数，程序却卡住了，这是怎么回事

1. import pygame
   
2. from pygame.locals import *
   
3. pygame.init()
   
4. Acolour = (255, 255, 255)
   
5. def changeC(colour, acolour = Acolour):
   
6.     acolour = colour
   
7. def say(story, surface, size, afont, k, colour = Acolour):
   
8.     Astory = list(story)
   
9.     Bstory = ""
   
10.     for i in Astory:
    
11.         Bstory = "".join([Bstory, i])
    
12.         pygame.draw.rect(surface, colour, (size[0]/2, size[1]/2, size[0], size[1]/4), 10)
    
13.         surface.blit(afont.render(Bstory, True, colour), (size[0]/2, size[1]/2))
    
14.     while not k[K_z]:
    
15.         surface.blit(afont.render(Bstory, True, colour), (size[0]/2, size[1]/2))
    
16.     pygame.time.delay(10)

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