PythonPath is a list of directories Python goes through to search for modules and files.
All you need to know, you find at [http://docs.python.org/install/index.html#modifying-python-s-search-path].

This is considered a very practical approach if you would like to have your apps outside the project directory.

'''How do you append directories to your Python path?'''

{{{
import sys
sys.path.append("/home/me/myapps")
}}}