kivy splash screen

from kivy.app import App
from kivy.uix.image import Image
from kivy.animation import Animation
from kivy.clock import Clock

class timer():
    def work1(self):
        print("Hello World")

class arge(App):

    def build(self):

        #Splash Screen
        wing = Image(source= "bookLogo.jpg",pos=(800,800))
        animation = Animation(x=0, y=0, d=2, t='out_bounce');
        animation.start(wing)


        Clock.schedule_once(timer.work1, 5) #run timer.work1 after 5 seconds

        return wing

if __name__ == '__main__':
    arge().run()