[pygame] Problem surfaces

[mrfaro@libero.it]

Hi

I wrote this function to create a list of surfaces containig only part 
of a give image...I look at azazel post and I saw thi function was 
similar to it...but I got a problem: it doesn't work...

Can anyone give me help??

Here it is:
def tile_array(img_tile):
 tiles = pygame.image.load(os.path.join("img",img_tile)).convert()
 image_map = []
 for a in range(len(tile_map)):
  surface = pygame.Surface((32,50))
  t = tile_map[a]
  rect = Rect(t[0],0,32,50)
  surface.blit(tiles,(0,0),rect)
  image_map.append(surface)
 return image_map

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