PyGTK has been deprecated in favor of PyGI+GTK and thus has never been
ported to python3. Using pygi-convert.sh from
https://git.gnome.org/browse/pygobject/tree/pygi-convert.sh helps
migrating most of the API but gnome-python.
The glade file has been converted to GtkBuilder using
gtk-builder-convert system-config-selinux.glade system-config-selinux.ui
and some fixes in order to provide an application window (object
GnomeApp disappeared, GtkVBox is deprecated, etc.). The associated
Python code also needed some modifications in order to migrate to
GtkBuilder.
The result has been tested on Arch Linux with Python 3.6. There are some
bugs in the GUI itself, for which patches will be sent afterwards.
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>