'Returns list of new items.'

def get_new(self):

    feed = feedparser.parse(self.url)
    new_entries = []
    for entry in feed['entries']:
        idval = (entry['id'] + entry.get('updated', ''))
        if (idval not in self.old_entries):
            self.old_entries[idval] = entry
            new_entries.append(entry)
    return new_entries
