The file pyCGNS/CGNS/wrap.py is a simple Python wrapper on top of the previous modules, it makes some checks or add some attributes or methods.
The file pyCGNS/CGNS/sidstech.py is the experimental OO Python interface for CGNS.
The other directories are containing Python scripts, all using the wrap modules. The directory names are explicits (demo, test, tools).
The documentation stands into pyCGNS/Doc and requires the use of the Python documentation system (styles and tools).
The code embedded documentation is available as HTML pages. It is extracted using the Happydoc tool (http://HappyDoc.sourceforge.net).