4.py

#!/usr/bin/env python -tt
# -*- coding: utf-8 -*-

from __future__ import print_function, unicode_literals
import os, os.path
import sys
import re
from pprint import pprint, pformat

var = 'hello world'
print('|', var[var.index('world'):], '|', sep='')
print('|', var[:var.index('world')], '|', sep='')

# |world|
# |hello |