blah.py

                        for f, f_index in face_index_pairs:
                            f_v = [(vi, me_verts[v_idx], l_idx)
                                    for vi, (v_idx, l_idx) in enumerate(zip(f.vertices, f.loop_indices))]

                            fw('%d' % (totverts + f_v[0][1].index))
                            for vi, v, li in f_v[1:]:
                                fw(', %d' % (totverts + v.index))