events_example.py

from events import Events


class Player(Events):
    itens = []

    __events__ = ('add_item_event',)

    def add_item(self, item):
        self.itens.append(item)
        self.add_item_event(item)


def something_to_happen_when_the_event_is_fired(item):
    print("A {} was added to the bag.".format(item))


if __name__ == '__main__':
    player = Player()
    player.add_item_event += something_to_happen_when_the_event_is_fired

    player.add_item("Knife")