python / kivy .kv file wont read
Question: I have just started learning to program I have a really basic App based on a
pong game tutorial on the kivy.org site but I must have a basic flaw that I
can't see as when I run the program all I am getting is a blank screen rather
than the expected canvas and labels. Please help me to waste less time on
basics!

    
    
    from kivy.app import App
    from kivy.uix.button import Button
    from kivy.uix.widget import Widget
    
    class Singularity(Widget):
        pass
    
    class SingularityApp(App):
        def build(self):
            return Singularity()
    
    if __name__ in ('__main__', '__android__'):
        SingularityApp().run()
    

and the singularity.kv:

    
    
    #:kivy 1.9.0
    
    <Singularity>:    
        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"
    


Answer:   * Check whether your MainApp(App) class name is same as your .kv file name without the 'App' (if not make them same) It's not case sensitive. for example: MaNagerApp(App) will load manager.kv

**OR**

  * If you don't want to change name then simply add self.load_kv(your_kv_file_name).

Like this:

    
    
    def build(self):
        self.load_kv('singularity.kv')
        return Singularity()
    

