How to use the podcastparser.parse function in podcastparser

def test_fail_parse(feed):
        with assert_raises(podcastparser.FeedParseError):
            podcastparser.parse('file://example.com/feed.xml', StringIO(feed))

try:
                    self._parse_feed(ad._resolved_url, None, None, False)
                    return Result(NEW_LOCATION, ad._resolved_url)
                except Exception as e:
                    logger.warn('Feed autodiscovery failed', exc_info=True)

                # Second, try to resolve the URL
                url = self._resolve_url(url)
                if url:
                    return Result(NEW_LOCATION, url)

            # Reset the stream so podcastparser can give it a go
            data.seek(0)

        try:
            feed = podcastparser.parse(url, data)
            feed['url'] = url
        except ValueError as e:
            raise InvalidFeed('Could not parse feed: {msg}'.format(msg=e))

        if is_local:
            feed['headers'] = {}
            return Result(UPDATED_FEED, feed)
        else:
            feed['headers'] = stream.headers
            return self._check_statuscode(stream, feed)

page = 2
        remaining_episodes = max_episodes - len(self.parsed['episodes'])
        while ('paged_feed_next' in self.parsed and
                page < self.PAGED_FEED_MAX_PAGES and
                remaining_episodes > 0):
            # Take the next page from the paged feed
            url = self.parsed['paged_feed_next']
            del self.parsed['paged_feed_next']

            if not url:
                break

            try:
                logger.debug('Downloading page %d from %s', page, url)
                stream = util.urlopen(url)
                parsed = podcastparser.parse(url, stream, remaining_episodes)
                added_episodes = len(parsed['episodes'])
                remaining_episodes -= added_episodes
                logger.debug('Page %d contains %d additional episodes', page,
                             added_episodes)
                self.parsed['episodes'].extend(parsed['episodes'])

                # Next iteration if we still have a next page
                if 'paged_feed_next' in parsed:
                    self.parsed['paged_feed_next'] = parsed['paged_feed_next']
            except Exception as e:
                logger.warn('Error while fetching feed page %d from %s: %s', page, url, e)
                # Give up, don't try to download additional pages here
                break

            page += 1