Hi,
I'm trying to update just the portions of my screen that change per frame.  The 
problem I'm having is that only the image I'm animating is showing up.  My 
background is not showing up -  background is now black.  

I'm not using Sprite/SpriteGroup, but I will soon, and I'm thinking I'll have 
the same problem when I try to render the dirty rects list returned by 
RnderUpdates.draw() method.


pseudocode:

background = pygame.image.load(background.png)
surface = pygame.image.load(spaceship)
while true:
    get events
    clear screen to white
    blit background
    blit spaceship  
    create rect of where surface is on screen
    pygame.display.update(rect)   # which in this case is a rectangle in the 
location of my animated surface



I'm following procedure from http://www.pygame.org/docs/tut/newbieguide.html:
  1.. Blit a piece of the background over the sprite's current location, 
erasing it. 
  2.. Append the sprite's current location rectangle to a list called 
dirty_rects. 
  3.. Move the sprite. 
  4.. Draw the sprite at it's new location. 
  5.. Append the sprite's new location to my dirty_rects list. 
  6.. Call display.update(dirty_rects)
Thanks for help
Ethan

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