Remove constant term

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[EDIT] I misunderstood your question, and you get an answer on your other question.[/EDIT] Your question does not make sense to me: You define K as the finite field with 25 elements, and R as the polynomial ring in z over K. Then, you define f which has nothing to do with R or K since it is a symbolic expression depending on a variable a! Actually, the code as you write it does not even work since a is undeclared. But let's say it is declared somewhere as a symbolic variable. You can either write simply f-4 to get no constant coefficient, or f-f(a=0). If f where a polynomial of the polynomial ring R (say f=2*z+4), you could also do f - f.constant_coefficient().