mesh.Tetrahedron()
mesh.Compute()
# get all volumes that have elements with length > 10
-filter = smesh.GetFilter(smesh.VOLUME, smesh.FT_MaxElementLength3D, smesh.FT_MoreThan, 10)
+filter = smesh.GetFilter(SMESH.VOLUME, SMESH.FT_MaxElementLength3D, SMESH.FT_MoreThan, 10)
ids = mesh.GetIdsFromFilter(filter)
print "Number of volumes with maximum element length > 10:", len(ids)