module-search-path

Why is there module search path instead of typing the directory name + typing the file name?

Is there an advantage? What is it? ...

how do I add a python module on MacOS X?

I'm trying to use pywn, a python library for using WordNet. I've played about with python a little under Windows, but am completely new at MacOS X stuff. I'm running under MacOS 10.5.8, so my default Python interpreter is 2.5.1 The pywn instructions say: "Put each of the .py files somewhere in your python search path." Where is the pyt...