Generate iCal in Django

gistfile1.py

from icalendar import Calendar, Event

def ical(request, course_id):
    try:
        # see if the course exists
        c = course.objects.get(id=course_id)
    except course.DoesNotExist:
        # redirect to search page in future
        raise Http404
    postCalendarItems = c.post_set.all()
    cal = Calendar()
    cal.add('prodid', '-//%s Events Calendar//%s//' % ('name', 'domain'))
    cal.add('version', '2.0')
    cal.add('x-wr-calname', c.name)

    for item in postCalendarItems:
        ical_event = Event()
        ical_event.add('summary', item.name)
        ical_event.add('description', item.description)
        ical_event.add('url', 'http://%s/class/%s/%s/' % (request.META['HTTP_HOST'], c.id, item.id))
        ical_event.add('dtstart', item.cal_date)
        ical_event.add('dtend', item.cal_date)
        ical_event.add('dtstamp', item.cal_date)
        ical_event['uid'] = '%d.event.events' % (item.id)
        cal.add_component(ical_event)

    response = HttpResponse(cal.to_ical(), mimetype="text/calendar")
    response['Content-Disposition'] = 'attachment; filename=%s.ics' % c.name
    return response