def on_config_change(self, config, section, key, value):
        Logger.info("main.py: App.on_config_change: {0}, {1}, {2}, {3}".format(
            config, section, key, value))

        if section == "My Label":
            if key == "text":
                self.root.ids.label.text = value
            elif key == 'font_size':
                self.root.ids.label.font_size = float(value)
L{Flags.iterconstants} returns an iterator over all of the constants
dataset/ETHPy150Open kivy/kivy/examples/settings/main.py/MyApp.on_config_change--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/python/test/test_constants.py/FlagsTests.test_iterconstants