Projects

Tarjama: GUI application showing words and their translations.
Moussi9a: GUI audio player.

Prerequisites

PyGTK+3 (LGPL) is packaged by Ubuntu (source).

Gnome buttons icons

sudo apt-get install gtk-3-examples
gtk3-icon-browser

Tutorials

Documentation of Python GTK+ 3.
Gnome documentation of PyGTK 2.
Gnome documentation of PyGio.
Source code of Gajim (uses Python GTK+ 3).