def build(self):
sm = ScreenManager(transition=NoTransition())
sm.config = ConfigParser()
sm.config.read('config.ini')
for section, options in self.config_defaults.items():
sm.config.setdefaults(section, options)
for section, options in self.config_update.items():
for option, value in options.items():
if sm.config.get(section, option) == '':
sm.config.set(section, option, value)
sm.config.write()
sm.config_defaults = self.config_defaults
sm.add_widget(MainScreen(name='main'))
sm.add_widget(SettingsScreen(name='settings'))
return sm
