import gi from gi.repository import Test import gtk if __name__ == "__main__": win = gtk.Window() # this works: # l = gtk.Label("Test Label") # this doesn't (test_label_new() is just a wrapper for gtk_label_new())) l = Test.label_new("Test Label") win.add(l) win.show_all() win.connect("destroy", gtk.main_quit) gtk.main()