On Mar 7, 2005, at 13:31, Pascal Peregrina wrote: > I just realized it as I was typing :) > > It's just that I have never used BTrees, while I have been using > PersisentMapping for a while. No fear, they act mostly like mappings themselves ;) Take a look at <zope>/lib/python/BTrees/Interfaces.py to see what you can and cannot do. jens