human
Complete the below
def _rewrite_saxena_1(fac, po, g, x):

    ''''Rewrite the integral fac*po*g dx, from zero to infinity, as
    integral fac*G, where G has argument a*x. Note po=x**s.
    Return fac, G.'
    '''
assistant
#Here is the Python program you requested.
    (_, s) = _get_coeff_exp(po, x)
    (a, b) = _get_coeff_exp(g.argument, x)
    period = g.get_period()
    a = _my_principal_branch(a, period)
    C = (fac / (abs(b) * (a ** (((s + 1) / b) - 1))))
    def tr(l):
        return [((a + ((1 + s) / b)) - 1) for a in l]
    return (C, meijerg(tr(g.an), tr(g.aother), tr(g.bm), tr(g.bother), (a * x)))