If you want to concatenate a property name with a Prim path, you can use Sdf.Path.AppendProperty. In this example, given Sdf.Path("/World/MyMesh") in mesh_prim_path, points_attr_path will contain Sdf.Path("/World/MyMesh.points").
If you want to concatenate a property name with a Prim path, you can use Sdf.Path.AppendProperty. In this example, given Sdf.Path("/World/MyMesh") in mesh_prim_path, points_attr_path will contain Sdf.Path("/World/MyMesh.points").