A few modules for pygame-based apps.

1. game.py defines an abstract class PygameApp, which can act as the parent class of such apps to form a basic structure for a pygame app. To add event handlers to a subclass, just code the handlers in metaclass EventHandlerMethods, with decorator event_tag used to map an event to a handler. To use the superclass' event handlers while defining your own, inherit your metaclass EventHandlerMethods from the parent class' metaclass, and call the parent class' constructor in your subclass' constructor.

    class MyPygameApp(PygameApp):
   
        # inherits from outer class' parent class' metaclass to use the parent's event handlers
        class EventHandlerMethods(PygameApp.EventHandlerMethods):
            
            @event_tag(<some event>)
            def on_some_event(self, *args, **kwargs):
                # handle <some event>
                
        def __init__(self, *args, **kwargs):
            super(MyPygameApp, self).__init__(*args, **kwargs)
            # init code