save gp object to sage readable sobj

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Hi all,

I am doing computation with a Pari readable table. Since I am a beginner to Pari, I would like to know that after defining a number field for example $K=nfinit(x^2-76)$, how do I play around with the generator $x$? This is super easy in Sage and may be silly question for people familiar with Pari. It also solve my problem if you know how to save a big matrix defined in Pari to an object readable by Sage.