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I agree, this is hard to read (probably a candidate for "What is broken on this site"). Having said that, I think the question is:

What module do I need to import in my .py file so that the above syntax works as expected?

I guess I don't know this answer, but maybe a workaround: The .< > notation is a shortcut for

R = PolynomialRing(ZZ,2,'z1,z2')

(z1,z2) = R.gens()

and the latter works when loaded from a .py file.