class SplashScreen(Screen):

    i=0
    def on_enter(self,*args):
        try:
           self.i +=5
           self.ids.progress.value=self.i
        except:
            Clock.unschedule(self.on_enter)
        else:
            pass
        finally:
            Clock.schedule_interval(self.on_enter,2)
            if self.i==100:
                self.manager.current='home'