from gi.repository import Gtk, GooCanvas

def main(args):
    w = Gtk.Window()
    w.connect('destroy', lambda x: Gtk.main_quit())

    cv = GooCanvas.Canvas()
    cv_root = cv.get_root_item()
    rect = GooCanvas.CanvasRect(
            parent = cv_root,
            stroke_color = 'red',
            x = 10, y = 20,
            width = 40, height = 30)

    w.add(cv)
    w.show_all()
    Gtk.main()

    return 0

if __name__ == '__main__':
    import sys
    sys.exit(main(sys.argv))