* Code in ``_transaction.py`` held on to local references to traceback objects after calling ``sys.exc_info()`` to get one, causing potential reference leakages. * Fixed ``hexlify`` NameError in ``transaction._transaction.oid_repr`` and add test. OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-transaction?expand=0&rev=15