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OK. The problem was that the polynomial g might be a constant in which case the degree might not work When I changed the line g = g- ttf1 to q= R(g- ttf1) the code worked. I still would appreciate any comment

OK. The problem was that the polynomial g might be a constant in which case the degree might not work When I changed the line g = g- ttf1 to q= R(g- ttf1) the code worked. I still would appreciate any commentcommenOf course the logic of the code was incorrect. The loop condition should have been d.degree()>f1.degree() and no neeed for the if statement. Still the error i encountered had nothing to do with this