With regards to official SDK's, not at the moment. We currently only have PHP and ActionScript 3 SDK's available. There may be someone in the community who has developed one though.

Jonathan LeBlanc
Senior Software Engineer
Yahoo! Developer Network

You can look at Leah Culver's OAuth library (http://oauth.googlecode.com/svn/code/python/) as a starting point. Since our APIs are very RESTful building the HTTP queries should be pretty painless in Python using urllib2.