Marius Gedminas wrote at 2008-1-21 00:08 +0200:
>Personally, I'd be afraid to use deepcopy on a persistent object.
A deepcopy is likely to be no copy at all.
As Python's "deepcopy" does not know about object ids, it is likely
that the copy result uses the same oids as the original.
When you store this copy, objects with the same oid are identified.
If you are lucky, then the ZODB recognizes the problem (because,
it is unable to store two different objects (the result of the "deepcopy")
with the same oid in its cache.
For more information about ZODB, see the ZODB Wiki:
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