Urlrewriter for anime-index.org

This is a urlrewriter plugin for http://tracker.anime-index.org/rss.php
I suppose that can be improved, but my python skills aren't enough
Is the last bit required (`&f=[DeadFish]%20Yowamushi%20Pedal:%20Grande%20Road%20-%2002%20[720p][AAC].mp4.torrent`)? If not, this rewrite could be a lot simpler and not have to request the details page.