def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
key = self.find_by_key_code(keycode)
if len(modifiers) == 0 and key is not None:
def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
key = self.find_by_key_code(keycode)
if len(modifiers) == 0 and key is not None: