[Python-Dev] Rietveld or Review Board use?

Is Rietveld or Review Board being used within the Python core development community? I looked at the dev guide but didn't see anything obvious about code reviews. I don't see how to search the Rietveld instance at codereview.appspot.com looking just for Python core review requests. My aim here is to provide some examples to a colleague at work. I wanted to give him some examples related to code with which I'm familiar. Thx, Skip