sugar-toolkit-gtk3/examples/combobox.py

from gi.repository import Gtk

from sugar3.graphics.combobox import ComboBox


def __combo_changed_cb(combo):
    print 'Combo changed to %r' % combo.get_value()

w = Gtk.Window()
w.connect("destroy", Gtk.main_quit)

combo = ComboBox()
combo.append_item(True, 'one')
combo.append_item(2, 'two', 'go-next')
combo.append_item('3', 'three')
# This will make 'two' active (zero indexed)
combo.set_active(1)
combo.connect('changed', __combo_changed_cb)
w.add(combo)

w.show_all()
Gtk.main()