Pelian3のfeedで特定のカテゴリを除外したかったのでplugin書いたよ

from pelican import signals
from pelican.generators import Generator
from collections import defaultdict
from operator import attrgetter

def get_generators(generators):
    return MyFeedGenerator

def register():
    signals.get_generators.connect(get_generators)

class MyFeedGenerator(Generator):
    """Generate atom/rss feed except wiki articles"""

    def __init__(self, *args, **kwargs):
        super(MyFeedGenerator, self).__init__(*args, **kwargs)

    def generate_feeds(self, writer):
        """Generate the feeds from the current context, and output files."""

        if (self.settings.get('FEED_ALL_ATOM')
                or self.settings.get('FEED_ALL_RSS')):
            all_articles = list(self.context['articles'])
            for article in self.context['articles']:
                all_articles.extend(article.translations)
            all_articles.sort(key=attrgetter('date'), reverse=True)

            all_articles_but_wiki = [x for x in all_articles if x.category != 'wiki']

            if self.settings.get('FEED_ALL_ATOM'):
                writer.write_feed(all_articles_but_wiki, self.context,
                                  'path/to/feed')

    def generate_output(self, writer):
        self.generate_feeds(writer)