How to use the icalendar.vCalAddress function in icalendar

def item_organizer(self, obj):
        organizer_dic = obj.get('organizer', None)
        if organizer_dic:
            if isinstance(organizer_dic, dict):
                organizer = icalendar.vCalAddress('MAILTO:%s' % organizer_dic['email'])
                for key, val in organizer_dic.items():
                    if key is not 'email':
                        organizer.params[key] = icalendar.vText(val)
            else:
                organizer = icalendar.vCalAddress('MAILTO:%s' % organizer_dic)
            return organizer

event.add('dtstart', obj['when'].date())
            else:
                continue

            event.add('summary', summary)

            end = obj.get('end')
            if not end:
                end = obj['when'] + datetime.timedelta(hours=1)
            event.add('dtend', end)

            event.add('location', obj.get('location', 'Unknown'))
            event['uid'] = obj['_id']

            for participant in obj['participants']:
                addr = icalendar.vCalAddress('MAILTO:noone@example.com')

                cn = participant['participant']

                if participant['type'] == 'committee':
                    cn += ' Committee'

                addr.params['cn'] = icalendar.vText(cn)
                #addr.params['ROLE'] = icalendar.vText('COMMITTEE')
                event.add('attendee', addr, encode=0)
                event['organizer'] = addr

            cal.add_component(event)

        return cal.as_string()

def matchAddress2vcal(self, address):
        return icalendar.vCalAddress("MAILTO:%s" % self.matchAddress(address) )

continue
        cal_event = icalendar.Event()
        cal_event.add('uid', u'UID:event-%s-%s@kiberpipa.org' % (e.id, e.slug))
        cal_event.add('summary', u'%s: %s' % (e.project, e.title))
        cal_event.add('url', u'https://www.kiberpipa.org%s' % e.get_absolute_url())
        cal_event.add('location', e.place.name)
        cal_event.add('classification', classification)
        cal_event.add('categories', u','.join([e.project.name, e.category.name]))
        # http://www.kanzaki.com/docs/ical/transp.html
        cal_event.add('transp', 'OPAQUE')
        # dtstamp means when was the last time icalendar feed has changed
        cal_event.add('dtstamp', ljubljana_tz.localize(datetime.datetime.now()))
        cal_event.add('dtstart', ljubljana_tz.localize(e.start_date))
        cal_event.add('dtend', ljubljana_tz.localize(e.end_date))
        cal_event.add('last-modified', ljubljana_tz.localize(e.chg_date))
        organizer = icalendar.vCalAddress(u'MAILTO:info@kiberpipa.org')
        organizer.params['cn'] = u'Kiberpipa'
        cal_event.add('organizer', organizer)
        cal.add_component(cal_event)

    response = HttpResponse(mimetype='text/calendar; charset=UTF-8')
    response.write(cal.to_ical())
    return response

event['uid'] = '20050115T101010/27346262376@mxm.dk'
        event.add('priority', 5)

        #event.add('attendee', 'mailto:argo@roots.ee')

        attendee = vCalAddress('MAILTO:argo.roots@artun.ee')
        attendee.params['cn'] = vText('Argo Roots')
        attendee.params['ROLE'] = vText('CHAIR')
        event.add('attendee', attendee, encode=0)

        attendee = vCalAddress('MAILTO:mihkel.putrinsh@artun.ee')
        attendee.params['cn'] = vText('Mihkel Putrinsh')
        attendee.params['ROLE'] = vText('REQ-PARTICIPANT')
        event.add('attendee', attendee, encode=0)

        attendee = vCalAddress('MAILTO:maxm3@example.com')
        attendee.params['cn'] = vText('Max Rasmussen 3')
        attendee.params['ROLE'] = vText('OPT-PARTICIPANT')
        #event.add('attendee', attendee, encode=0)

        attendee = vCalAddress('MAILTO:maxm4@example.com')
        attendee.params['cn'] = vText('Non')
        attendee.params['ROLE'] = vText('NON-PARTICIPANT')
        #event.add('attendee', attendee, encode=0)

        cal.add_component(event)

        event = Event()
        event.add('summary', 'Python meeting about calendaring 2')
        event.add('dtstart', date(2011,4,6))
        event.add('dtend', date(2011,4,6))
        event.add('dtstamp', datetime(2011,4,4,0,10,0,tzinfo=UTC))

event['uid'] = obj['_id']

            status = obj.get('status')
            if status:
                event.add('status', status.upper())

            notes = obj.get('notes')
            if notes:
                event.add('description', notes)

            link = obj.get('link')
            if link:
                event.add('attach', link)

            for participant in obj['participants']:
                addr = icalendar.vCalAddress('MAILTO:noone@example.com')

                chamber = participant.get('chamber')
                if chamber:
                    cn = chamber_name(obj[obj['level']], chamber) + " "
                else:
                    cn = ""

                cn += participant['participant']

                if participant['type'] == 'committee':
                    cn += ' Committee'

                addr.params['cn'] = icalendar.vText(cn)
                #addr.params['ROLE'] = icalendar.vText('COMMITTEE')
                event.add('attendee', addr, encode=0)
                event['organizer'] = addr

event_component = icalendar.Event()
                event_component.add('summary', session.title)
                event_component.add('uid', str(session.id) + "-" + event.identifier)
                event_component.add('geo', (event.latitude, event.longitude))
                event_component.add('location', session.microlocation.name or '' + " " + event.location_name)
                event_component.add('dtstart', tz.localize(session.starts_at))
                event_component.add('dtend', tz.localize(session.ends_at))
                event_component.add('email', event.email)
                event_component.add('description', session.short_abstract)
                event_component.add('url', url_for('event_detail.display_event_detail_home',
                                                   identifier=event.identifier, _external=True))

                for speaker in session.speakers:
                    # Ref: http://icalendar.readthedocs.io/en/latest/usage.html#file-structure
                    # can use speaker.email below but privacy reasons
                    attendee = vCalAddress('MAILTO:' + event.email if event.email else 'undefined@email.com')
                    attendee.params['cn'] = vText(speaker.name)
                    event_component.add('attendee', attendee)

                cal.add_component(event_component)

        return cal.to_ical()

def item_organizer(self, item):
        """Get item organizer."""
        organizer = item.timesheet.user.email
        organizer = vCalAddress(organizer)
        organizer.params["CN"] = str(item.timesheet.user)

        return organizer