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Complete this python program:
def _int0oo(g1, g2, x):
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#Here is the Python code you requested.

    """Express integral from zero to infinity g1*g2 using a G function,
    assuming the necessary conditions are fulfilled.
    >>> from sympy.integrals.meijerint import _int0oo
    >>> from sympy.abc import s, t, m
    >>> from sympy import meijerg, S
    >>> g1 = meijerg([], [], [-S(1)/2, 0], [], s**2*t/4)
    >>> g2 = meijerg([], [], [m/2], [-m/2], t/4)
    >>> _int0oo(g1, g2, t)
    4*meijerg(((1/2, 0), ()), ((m/2,), (-m/2,)), s**(-2))/s**2
    """
    (eta, _) = _get_coeff_exp(g1.argument, x)
    (omega, _) = _get_coeff_exp(g2.argument, x)
    def neg(l):
        return [(- x) for x in l]
    a1 = (neg(g1.bm) + list(g2.an))
    a2 = (list(g2.aother) + neg(g1.bother))
    b1 = (neg(g1.an) + list(g2.bm))
    b2 = (list(g2.bother) + neg(g1.aother))
    return (meijerg(a1, a2, b1, b2, (omega / eta)) / eta)