I'm doing a little program and I want to distribute it using this recipe:

single directory with __main__.py in it
zip this directory and adding a shebang on it #!/usr/bin/env python
making it executable

The problem is that in this package I have also extra files (I'm using pygtk toolkit and I need images and ui xml files). When I try to access these files I have the error that the resource is unavailable (the path that I'm trying to open is something like file.zip/gui/gui.ui ).
How can I handle this situation?
I figured out by myself, It's sufficient to use pkgutil.get_data to access the data inside a package.
Distributing an executable zip file with __main__.py, how to access extra data?