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By making a list of polynomials?
sage: R.<t> = QQ[]
sage: L = [t^2+1, t^3+1, t^4+t^2-5]
sage: type(L[2])
<type 'sage.rings.polynomial.polynomial_rational_flint.Polynomial_rational_flint'>
Here I assume you mean real polynomials, and not symbolic expressions that happen to be polynomials, like
sage: x^2+1
x^2 + 1
sage: type(_)
<type 'sage.symbolic.expression.Expression'>
