human
Solve the following python programming problem given the following code:
def _rewrite_saxena(fac, po, g1, g2, x, full_pb = False) : 
    '
    Rewrite the integral fac*po*g1*g2 from 0 to oo in terms of G functions
    with argument c*x.
    Return C, f1, f2 such that integral C f1 f2 from 0 to infinity equals
    integral fac po g1 g2 from 0 to infinity.

    >>> from sympy.integrals.meijerint import _rewrite_saxena
    >>> from sympy.abc import s, t, m
    >>> from sympy import meijerg
    >>> g1 = meijerg([], [], [0], [], s*t)
    >>> g2 = meijerg([], [], [m/2], [-m/2], t**2/4)
    >>> r = _rewrite_saxena(1, t**0, g1, g2, t)
    >>> r[0]
    s/(4*sqrt(pi))
    >>> r[1]
    meijerg(((), ()), ((-1/2, 0), ()), s**2*t/4)
    >>> r[2]
    meijerg(((), ()), ((m/2,), (-m/2,)), t/4)
    ' 
    from sympy.core.numbers import ilcm 
    def pb(g) : 
        (a, b) = _get_coeff_exp (g.argument, x) 
        per = g.get_period () 
        return meijerg (g.an, g.aother, g.bm, g.bother, (_my_principal_branch (a, per, full_pb) * (x ** b))) 
(_, s) = _get_coeff_exp (po, x) 
    (_, b1) = _get_coeff_exp (g1.argument, x) 
    (_, b2) = _get_coeff_exp (g2.argument, x) 
    if ((b1 < 0) == True) : 
        b1 = (- b1) 
        g1 = _flip_g (g1) 
if ((b2 < 0) == True) : 
        b2 = (- b2) 
        g2 = _flip_g (g2) 
if ((not b1.is_Rational) or (not b2.is_Rational)) : 
        return 
(m1, n1) = (b1.p, b1.q) 
    (m2, n2) = (b2.p, b2.q) 
    tau = ilcm ((m1 * n2), (m2 * n1)) 
    r1 = (tau // (m1 * n2)) 
    r2 = (tau // (m2 * n1)) 
    (C1, g1) = _inflate_g (g1, r1) 
    (C2, g2) = _inflate_g (g2, r2) 
    g1 = pb (g1) 
    g2 = pb (g2) 
    fac *= (C1 * C2) 
    (a1, b) = _get_coeff_exp (g1.argument, x) 
    (a2, _) = _get_coeff_exp (a2.argument, x) 
    exp = (((s + 1) / b) - 1) 
    fac = (fac / (abs (b) * (a1 ** exp))) 
    def tr(l) : 
        return [(a + exp) for a in l] 
g1 = meijerg (tr (g1.an), tr (g1.aother), tr (g1.bm), tr (g1.bother), (a1 * x)) 
    g2 = meijerg (g2.an, g2.aother, g2.bm, g2.bother, (a2 * x)) 
    return (powdenest (fac, polar = True), g1, g2) 

    
    

    Fix the buggy line: (a2, _) = _get_coeff_exp (a2.argument, x)
assistant
#Here is Python code to fix the buggy line: (a2, _) = _get_coeff_exp (a2.

(a2, _) = _get_coeff_exp (g2.argument, x)