first commit

kivy_venv/share/kivy-examples/tutorials/pong/steps/step3/main.py

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+from kivy.app import App
+from kivy.uix.widget import Widget
+from kivy.properties import NumericProperty, ReferenceListProperty
+from kivy.vector import Vector
+
+
+class PongBall(Widget):
+    velocity_x = NumericProperty(0)
+    velocity_y = NumericProperty(0)
+    velocity = ReferenceListProperty(velocity_x, velocity_y)
+
+    def move(self):
+        self.pos = Vector(*self.velocity) + self.pos
+
+
+class PongGame(Widget):
+    pass
+
+
+class PongApp(App):
+    def build(self):
+        return PongGame()
+
+
+if __name__ == '__main__':
+    PongApp().run()

kivy_venv/share/kivy-examples/tutorials/pong/steps/step3/pong.kv

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+#:kivy 1.0.9
+
+<PongBall>:
+    size: 50, 50 
+    canvas:
+        Ellipse:
+            pos: self.pos
+            size: self.size          
+
+<PongGame>:
+    canvas:
+        Rectangle:
+            pos: self.center_x - 5, 0
+            size: 10, self.height
+    
+    Label:
+        font_size: 70  
+        center_x: root.width / 4
+        top: root.top - 50
+        text: "0"
+        
+    Label:
+        font_size: 70  
+        center_x: root.width * 3 / 4
+        top: root.top - 50
+        text: "0"
+    
+    PongBall:
+        center: self.parent.center
+        
+