main.py:

from kivy.app import App
from kivy.uix.widget import Widget


class pongGame(Widget):
    pass


class pongApp(App):
    def build(self):
        return pongGame()


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

pong.kv:

#:kivy 1.0.9

<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"

Shell:

[INFO              ] Kivy v1.8.0
[INFO              ] [Logger      ] Record log in C:\Users\rabbitrabbit\.kivy\logs\kivy_14-08-22_2.txt
[INFO              ] [Factory     ] 157 symbols loaded
[DEBUG             ] [Cache       ] register <kv.lang> with limit=None, timeout=Nones
[DEBUG             ] [Cache       ] register <kv.image> with limit=None, timeout=60s
[DEBUG             ] [Cache       ] register <kv.atlas> with limit=None, timeout=Nones
[INFO              ] [Image       ] Providers: img_tex, img_dds, img_pygame, img_gif (img_pil ignored)
[DEBUG             ] [Cache       ] register <kv.texture> with limit=1000, timeout=60s
[DEBUG             ] [Cache       ] register <kv.shader> with limit=1000, timeout=3600s
[DEBUG             ] [App         ] Loading kv <C:\pong_directory.py\pong.kv>
[DEBUG             ] [App         ] kv <C:\pong_directory.py\pong.kv> not found
[DEBUG             ] [Window      ] Ignored <egl_rpi> (import error)
[INFO              ] [Window      ] Provider: pygame(['window_egl_rpi'] ignored)
[DEBUG             ] [Window      ] Display driver windib
[DEBUG             ] [Window      ] Actual window size: 800x600
[DEBUG             ] [Window      ] Actual color bits r8 g8 b8 a0
[DEBUG             ] [Window      ] Actual depth bits: 24
[DEBUG             ] [Window      ] Actual stencil bits: 8
[DEBUG             ] [Window      ] Actual multisampling samples: 2
GLEW initialization succeeded
[INFO              ] [GL          ] OpenGL version <b'2.1.2'>
[INFO              ] [GL          ] OpenGL vendor <b'NVIDIA Corporation'>
[INFO              ] [GL          ] OpenGL renderer <b'Quadro NVS 110M/PCI/SSE2'>
[INFO              ] [GL          ] OpenGL parsed version: 2, 1
[INFO              ] [GL          ] Shading version <b'1.20 NVIDIA via Cg compiler'>
[INFO              ] [GL          ] Texture max size <4096>
[INFO              ] [GL          ] Texture max units <16>
[DEBUG             ] [Shader      ] Fragment compiled successfully
[DEBUG             ] [Shader      ] Vertex compiled successfully
[DEBUG             ] [ImagePygame ] Load <C:\Python33\lib\site-packages\kivy\data\glsl\default.png>
[INFO              ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO              ] [OSC         ] using <thread> for socket
[DEBUG             ] [Base        ] Create provider from mouse
[DEBUG             ] [Base        ] Create provider from wm_touch
[DEBUG             ] [Base        ] Create provider from wm_pen
[INFO              ] [Base        ] Start application main loop
[INFO              ] [Base        ] Leaving application in progress...

Thank you for taking the time to read this.

Bump. Is there really no one who has any idea what's going on? I've been stuck on this for a week.

Hello mate,

I spot one thing immediately wrong

The shell clearly shows "Start application main loop" and then "Leaving application...".

So yes, your code syntax and logic is fine. But somethings making Kivy leave the main loop. That something is that it isn't actually told anything to do.

You have a problem with your pongApp(App) class. pongGame is a class itself, so you need to create an instance, or object, from it first and return that.

Add something like this to the build function:

game = pongGame()
return game

And I hope that has solved the issue, let me know if not.

Ilmiont

Hi Ilmiont, thanks for responding. The "Leaving application" being included was a mistake on my part, I closed the program and then copied what was in the shell. That doesn't appear when I run the program without closing it. I added what you suggested to the the build function, but there wasn't any difference.