It also includes a built-in Python shell interface that you can use to programmatically manipulate the GUI. You can even use it to add new GTK+ widgets to a window while the program is running.

Python 3 support is more complicated, though – because some UIs (e.g. the QML UI, which depends on the PySide bindings to Qt) are not yet compatible with Python 3, or lack support elsewhere (e.g ...