Kapil Thangavelu wrote:

ZOPE_HOME/lib/python/Shared/DC/ZRDB/TM.py

Glancing over the Transaction TM mixin class... i noticed a line commit=tpc_abort=tpc_begin

i can understand tpc_begin=commit, but the abort seems strange. if an abort happens in the two phase commit the equality doesn't make sense to me.

whats going on here? Is this meant to be overidden?

Yes. Override the methods that you need to. The rest are given a no-operation default implementation. The class more or less defines an interface. def tpc_begin(self, *ignored): pass commit=tpc_abort=tpc_begin The assignment you see is just a short-hand way of saying that commit, tpc_abort and tpc_begin have the same method signature and the same implementation -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net