Add a pygame.KEYDOWN event handler.

        actions - The methods to be called when this key is pressed.

        kwargs - The kwargs to be passed to self.add_handler.

        See the documentation for self.add_handler for examples.

def add_keydown(self, actions, **kwargs):
        """
        Add a pygame.KEYDOWN event handler.

        actions - The methods to be called when this key is pressed.

        kwargs - The kwargs to be passed to self.add_handler.

        See the documentation for self.add_handler for examples.
        """
        return self.add_handler(pygame.KEYDOWN, actions, **kwargs)