Importing modules from parent folder

Question

I am running Python 2.5.

This is my folder tree:

ptdraft/
  nib.py
  simulations/
    life/
      life.py

(I also have __init

Answer 1

Don't know much about python 2.
In python 3, the parent folder can be added as follows:

import sys 
sys.path.append('..')

...and then one is able to import modules from it