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Like that ?
P.<C> = PolynomialRing(QQ)
P(g[0].rhs())
A basic example:
sage: P = PolynomialRing(QQ,'x')
sage: type(x)
<type 'sage.symbolic.expression.Expression'>
sage: P(x**3+4)
x^3 + 4
sage: type(P)
<class 'sage.rings.polynomial.polynomial_ring.PolynomialRing_field_with_category'>
