SetAnimated is listed under Shader Node Input methods.

I think you would be better writing a toggle function. I am not entirely sure what exactly you are after, but maybe something like this would work

import poser
scene=poser.Scene()

def toggleanim(scene,framecount,toggle=False):
    scene.SetFrame(0)
    if toggle:
        for frame in range(frames):
            scene.SetFrame(frame)
    else:
        return False

toggleanim(scene, framecount, True)

the third value ( True ) should overwrite the default of False and therefore the animation should toggle (in this case frame by frame)

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