import gi gi.require_version('Gtk', '3.0') from gi.repository import Gtk from callbacks import CallbackHandler builder = Gtk.Builder() builder.add_from_file("main.glade") callback_handler = CallbackHandler(builder) handlers = { "onDestroy": Gtk.main_quit , "on_manually_add_submit_button_clicked": callback_handler.on_manually_add_submit_button_clicked , "on_load_from_file_submit_button_clicked": callback_handler.on_load_from_file_submit_button_clicked , "on_save_question_to_file_submit_button_clicked": callback_handler.on_save_question_to_file_submit_button_clicked } builder.connect_signals(handlers) window = builder.get_object("window1") window.show_all() Gtk.main()