what does ratpoly.<t> = PolynomialRing(QQ) mean

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Chong Wang
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In official tutorial, I see the following command:

ratpoly.<t> = PolynomialRing(QQ)

I have python backgroud. I wonder what does it do and how it is implemented. After all, variable ratpoly is not defined previously.

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SL
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Sage does some preparsing on what you type. You can see what happens with the command preparse

 sage: preparse('ratpoly.<t> = PolynomialRing(QQ)')
 "ratpoly = PolynomialRing(QQ, names=('t',)); (t,) = ratpoly._first_ngens(1)"

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Last updated: Jan 15 '15