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polynomials of derivative operator

Is there any way in Sage to evaluate expressions such as p(x^2d/dx + a + x - x^2y) 1 where p() is a polynomial in one variable? The result would be a polynomial in a,x, and y.

Alternatively, can Sage evaluate (1/f) p(d/dx) f where f is a (non-polynomial) function of x and a and y?

Thanks very much.