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Just put

f(x) = f

toward the top of your main function. The point is that we have deprecated substituting in f = x^2 because of nasty things like g = x^2 + y - y where it's not clear whether g(1) should be about the y or the x. (You can search the Sage email lists for more looooong discussions about this.)

Here is a live example. Looks nice!

(Naturally, this does assume that x will be your variable.)