Python 3 -- bzr works? not?

[Michael Talbot-Wilson]

I'm unable to find the answer to this question on either the Bazaar or
the Python site.

I want to install Python so that bzr can be used system-wide.
Currently one user (me) has bzr 2.6b1 and Python 2.7.3rc2 in the home
directory but if I'm installing system-wide I'd prefer to be up to
date.

So, what versions of Bazaar, 2.5, 2.6, neither, are unproblematic on
Python 3?