-print "Number of triangles:", len(ids_tri)
-print "Number of quadrangles:", len(ids_qua)
-print "Number of tetrahedrons:", len(ids_tet)
-print "Number of pyramids:", len(ids_pyr)
+print("Number of triangles:", len(ids_tri))
+print("Number of quadrangles:", len(ids_qua))
+print("Number of tetrahedrons:", len(ids_tet))
+print("Number of pyramids:", len(ids_pyr))