def update_cal_summary(self, i):
        if self.every_unit == Recurrencies.once:
            return dd.babelattr(self.event_type, 'event_label')
        return (dd.babelattr(self.event_type, 'event_label'), i) % "%s %s"
dataset/ETHPy150Open lsaffre/lino/lino/modlib/rooms/models.py/Booking.update_cal_summary/swapped operands of `%`