[pygame] Does my sprite need a __len__ method? (Corrected message)

[Jim Scott <jimdscottesq@yahoo.com>]

I'm getting an error message that I can't seem to correct. I was hoping someone
could give me a clue.

ERROR MESSAGE: Platform instance has no attribute '__len__'


Platform is a sprite class I created.

I call this:
for sprite in self.elves.sprites():
  # tell AI to update each elf based on current players and barriers
  self.AI.update(sprite, self.playerGroup.sprites(), self.barriers.sprites())

Here's the AI.update function. If I don't call this function, I don't get the
error message.

def update(self, controlledSprite, playerList, barrierList):
  if not controlledSprite.patrol:
	# create the biggest rect possible centered on the current
	# position and make this the patrol rect. the elf will circle
	# about the patrol rect until it has reason to attack or flee
	controlledSprite.patrol = Rect(controlledSprite.rect)
	pr = controlledSprite.patrol
	# grow left
	while pr.collidelist(barrierList) == -1:
	        if pr.left < SCREENRECT.left: break
	        pr.move_ip(-1,0)
	        pr.inflate_ip(1,0)
		pr.move_ip(1,0)
	pr.inflate_ip(-1,0)
			
	# grow right
	while pr.collidelist(barrierList) == -1:
		if pr.right > SCREENRECT.right: break
		pr.inflate_ip(1,0)
	pr.inflate_ip(-1,0)
			
	# grow up
	while pr.collidelist(barrierList) == -1:
		if pr.top < SCREENRECT.top: break
		pr.move_ip(0,-1)
		pr.inflate_ip(0,1)
	pr.move_ip(0,1)
	pr.inflate_ip(0,-1)
			
	# grow down
	while pr.collidelist(barrierList) == -1:
		if pr.bottom > SCREENRECT.bottom: break
		pr.inflate_ip(0,1)
	pr.inflate_ip(0,-1)
	
Here's some error data I've printed:	
Error trying to update: Elf: 0 rect: <rect(1026, 680, 32, 43)> vx: 0 vy: 0 x:
10
42.0 y: 701.0 acc: 0 lives: 3
patrolRect: <rect(0, 657, 1200, 75)> 
barriers: [<Platform sprite(in 2 groups)>, <Platform sprite(in 2 groups)>,
<Plat
form sprite(in 2 groups)>, <Platform sprite(in 2 groups)>, <Platform sprite(in
2
 groups)>, <Platform sprite(in 2 groups)>]
<Platform sprite(in 2 groups)> <rect(241, 637, 310, 20)>
<Platform sprite(in 2 groups)> <rect(585, 101, 20, 530)>
<Platform sprite(in 2 groups)> <rect(68, 340, 260, 20)>
<Platform sprite(in 2 groups)> <rect(822, 277, 290, 20)>
<Platform sprite(in 2 groups)> <rect(720, 732, 480, 20)>
<Platform sprite(in 2 groups)> <rect(0, 790, 1200, 20)>





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