def __init__(self, request,
                 group_slug=None, bridge=None,
                 article_qs=ALL_ARTICLES, changes_qs=ALL_CHANGES, 
                 extra_context=None, 
                 title_template = u'feeds/history_title.html', 
                 description_template = u'feeds/history_description.html', 
                 *args, **kw):

        if  group_slug is not None:
            try:
                group = bridge.get_group(group_slug)
            except __HOLE__:
                raise Http404
            self.changes_qs = changes_qs.filter(article__content_type=get_ct(group), 
                                                article__object_id=group.id)
        else:
            self.changes_qs = changes_qs

        self.title_template = title_template
        self.description_template = description_template
        super(RssHistoryFeed, self).__init__('', request)
dataset/ETHPy150Open brosner/django-wikiapp/wiki/feeds.py/RssHistoryFeed.__init__