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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def gf_poly_mul_simple(p, q): # simple equivalent way of multiplying two polynomials without precomputation, but thus it's slower
    '''Multiply two polynomials, inside Galois Field'''
    # Pre-allocate the result array
    r = bytearray(len(p) + len(q) - 1)
    # Compute the polynomial multiplication (just like the outer product of two vectors, we multiply each coefficients of p with all coefficients of q)
    for j in xrange(len(q)):
        for i in xrange(len(p)):
            r[i + j] ^= gf_mul(p[i], q[j]) # equivalent to: r[i + j] = gf_add(r[i+j], gf_mul(p[i], q[j])) -- you can see it's your usual polynomial multiplication
    return r