The Python X Library is a complete X11R6 client-side implementation, written in pure Python.
It can be used to write low-levelish X Windows client applications in Python.
The project is now migrated to Github, where support for Python 3 is being added and the license has changed to LGPL. The files and code available here are no longer recommended to be used.
Github repository: https://github.com/python-xlib/python-xlib
This is a very well package for x11 system on python, but a change of license from GPL to PSFL would be appreciated.