# pass group0 and ids of faces of group1 to inverse
nbRev = mesh3D.Reorient2DBy3D([ group0, group1.GetIDs() ], mesh3D, theOutsideNormal=False)
-print "Nb reoriented faces:", nbRev
+print("Nb reoriented faces:", nbRev)
# orient the reversed faces back
nbRev = mesh3D.Reorient2DBy3D( mesh3D, mesh3D, theOutsideNormal=True)
-print "Nb re-reoriented faces:", nbRev
+print("Nb re-reoriented faces:", nbRev)