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You want to access the generators of R as a tuple:

sage: R = PolynomialRing(QQ, 3, names='x'); R
Multivariate Polynomial Ring in x0, x1, x2 over Rational Field
sage: x = R.gens(); x
(x0, x1, x2)
sage: x[0]

If you want to use some strange alternative indexing, then you can achieve it with a function.