The Seattle Public Library no longer offers RSS feeds of checkouts or holds, so this no longer works. It may, however, be useful to some people as a prototype. To get holds and checkouts from the Seattle Public Library, you might try my fork of checkcards.
This python cgi script downloads RSS feeds from the Seattle Public Library and parses them. It then prints out a table of books you have checked out and books you have on hold.
Requires the feedparser python module.
In the first few lines of the code, there is a place for the private RSS feed addresses that you can get from the Seattle Public Library. You will need to edit these before using.