human
Here's a good function header given the following:
I wrote the below code

    f = sympify(f)
    def do_replace(ap, bq, z):
        r = _hyperexpand(Hyper_Function(ap, bq), z, rewrite=rewrite)
        if (r is None):
            return hyper(ap, bq, z)
        else:
            return r
    def do_meijer(ap, bq, z):
        r = _meijergexpand(G_Function(ap[0], ap[1], bq[0], bq[1]), z, allow_hyper, rewrite=rewrite, place=place)
        if (not r.has(nan, zoo, oo, (- oo))):
            return r
    return f.replace(hyper, do_replace).replace(meijerg, do_meijer)

What's a good function header?
assistant
#Here's a good function header.

def hyperexpand(f, allow_hyper=False, rewrite='default', place=None):