p-adic power series
I am new to Sage and I want to to do some math on p-adic power series. I want to define such a power series but I did not succeeded. The last line of the following code rises an exception:
p = 2 q = 4 K = Qp(p) L.<omega> = Qq(q) O_L = L.integer_ring() R.<X> = PowerSeriesRing(O_L) pi = L.uniformizer() q = L.residue_class_degree() f(X) = X^q + pi*X
TypeError: unsupported operand parent(s) for '*': '2-adic Field with capped relative precision 20' and 'Symbolic Ring'
Can someone help me, please? Thanks for your time!