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The example you've provided is not working for me 'as is', an exception occurs:

TypeError: descriptor 'parent' of 'sage.structure.sage_object.SageObject' object needs an argument

Nonetheless if you need to create an animation from a complicated plot, why not just use Python's list? animate function seems to work fin with that. Here is an example of animation from the frames created from two plots each:

import numpy as np

plots = []

N = 64

for phi in np.arange(0, pi, pi / N):
    frame = plot(sin(x + phi), 0, 2 * pi)
    frame += line([(0, sin(phi)), (2 * pi, sin(phi))], linestyle='--')