code: def _rpartition(entity, sep):
      
      idx = entity.rfind(sep)
      if idx == -1:
          return '', '', entity
      return entity[:idx], sep, entity[idx + 1:]
docs: Python2.4 doesn't have an rpartition method so we provide
      our own that mimics str.rpartition from later releases.
  
      Split the string at the last occurrence of sep, and return a
      3-tuple containing the part before the separator, the separator
      itself, and the part after the separator. If the separator is not
      found, return a 3-tuple containing two empty strings, followed
      by the string itself.