Generator matrix of RS-code

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You can apply the integer_representation method to each entry of the matrix:

sage: C.generator_matrix().apply_map(lambda w: w.integer_representation(), R=ZZ)
[ 1  1  1  1  1  1  1  1  1]
[ 1 54 18 14 51 17 15  5  3]
[ 1 18 51 15  3 54 14 17  5]
[ 1 14 15  1 14 15  1 14 15]

Note that the result depends on the choice of modulus for the finite field.