like getting information about changesets/comments etc.
First off, if you are on Windows, you should consider using the "Python 2.x" installers rather than the standalone installer for Bazaar. This will install bzrlib in Python's site-packages directory, so you don't have to mess around with %PYTHONPATH%. If you have already used the stanadalone installer, you'll need to add lib/ and lib/library.zip from your Bazaar installation directory to the PYTHONPATH environment variable. If you chose the default, this is C:\Program Files\Bazaar
Once you can successfully import bzrlib, some examples showing how to actually interact with the bzr backend can be found on the Bazaar wiki.
For details, see Integrating with Bazaar in the Bazaar developer documentation
来源：https://stackoverflow.com/questions/2864789/how-can-i-read-bzr-repository-from-python-script