text: import kivy
  kivy.require('1.9.0')
  from kivy.app import App
  from kivy.lang import Builder
  from kivy.uix.anchorlayout import AnchorLayout
  from kivy.uix.boxlayout import BoxLayout
  from kivy.uix.screenmanager import ScreenManager, Screen
  from kivy.uix.widget import Widget
  
  
  class CustomWidget(Widget):
      pass
  
  class CustomWidgetApp(App):
      def build(self):
          return CustomWidget()
  
  if __name__=="__main__":
      CustomWidgetApp().run()
  