@property
    def organizer(self):
        if self._vevents[self.ref] not in 'ORGANIZER':
            return ''
        organizer = self._vevents[self.ref]['ORGANIZER']
        cn = organizer.params.get('CN', '')
        email = organizer.split(':')[-1]
        if cn:
            return '{} ({})'.format(cn, email)
        else:
            return email
dataset/ETHPy150Open pimutils/khal/khal/khalendar/event.py/Event.organizer/swapped operands of `not in`