save animated GIF with Python Image Library

[christof.hoeke at e-7.com]

hi,
how can i save an animated GIF with PIL. 
 
e.g. i like to rotate all frames of an image and tried the following:
 
im = Image.open('anim.gif')
for f in ImageSequence(im): #using the class from the PIL handbook
    if f:
        f = f.rotate(180)
im.save('animrotated.gif')
 
problem is that only one frame (i guess the last one) is saved.
i could not find any options for saving GIFs in the handbook.
 
can this be done at all?
 
thanks 
christof
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