--- /dev/null
+# Belong to Cylinder
+
+# create mesh
+from mechanic import *
+
+# get all faces which lie on the cylindrical face \a sub_face1
+filter = smesh_builder.GetFilter(SMESH.FACE, SMESH.FT_BelongToCylinder, sub_face1)
+ids = mesh.GetIdsFromFilter(filter)
+print("Number of faces which lie on the cylindrical surface sub_face1:", len(ids))