text: import kivy
  kivy.require('1.0.5')
  
  from kivy.uix.floatlayout import FloatLayout
  from kivy.app import App
  from kivy.properties import ObjectProperty, StringProperty
  
  
  class Controller(FloatLayout):
      '''Create a controller that receives a custom widget from the kv lang file.
  
      Add an action to be called from the kv lang file.
      '''
      label_wid = ObjectProperty()
      info = StringProperty()
  
      def do_action(self):
          self.label_wid.text = 'My label after button press'
          self.info = 'New info text'
  
  
  class ControllerApp(App):
  
      def build(self):
          return Controller(info='Hello world')
  
  
  if __name__ == '__main__':
      ControllerApp().run()
  