class CreatePurchase:
    __metaclass__ = PoolMeta
    __name__ = 'purchase.request.create_purchase'

    @classmethod
    def __setup__(cls):
        super(CreatePurchase, cls).__setup__()
        init = StateTransition()
        cls.start_state = 'init'

    def transition_init(self):
        print 'init'
        return 'start'