Python Software Foundation's Infrastructure commitee put out a call for trackers (bug/request/issue/ticket trackers) in June 2006 in order to evaluate alternatives to SourceForge for use by the Python development team. A copy of that request can be found at OriginalCallForTrackers.
Jira was the first choice of the committee. A lot of people complained about using a closed-source and hosted bug tracker, so a call was posted for volunteers to help administer a Roundup installation. Enough volunteers came forward, so work is now proceeding on improving the conversion to Roundup.
Bugs found in the living installation of Roundup for Python bugs are reported to meta-tracker -- is at http://psf.upfronthosting.co.za/roundup/meta/ Please report problems with the bug tracker there.