def increment_sequence(self):
        """update the SEQUENCE number, call before saving this event"""
        # TODO we might want to do this automatically in raw() everytime
        # the event has changed, this will f*ck up the tests though
        try:
            self._vevents[self.ref]['SEQUENCE'] += 1
        except __HOLE__:
            self._vevents[self.ref]['SEQUENCE'] = 0
dataset/ETHPy150Open pimutils/khal/khal/khalendar/event.py/Event.increment_sequence