Skip Montanaro writes:

I'm trying to publish my own module with ZServer (from Zope 2.2.0). I get the following traceback:

.... from Persistence import Persistent ImportError: cannot import name Persistent

When I look at lib/python/Persistence.py, all I see is a copyright notice and the following short doc string:

"""Provide access to Persistent and PersistentMapping

This avoids dependency on the database package name. """

I can't find a definition of an object named Persistent (probably ought to be a class or ExtensionClass, based upon the usage I saw) anywhere in the Zope 2.2.0 tree.

"Persistence" is only a "placeholder" module that gets filled by the really used Object Database package (ZODB, BoboPOS2, BoboPOS3, ...) that implements persistence. For the current Zope, "ZODB/__init__.py" fills this module with "cPersistence.Persistent" and "PersistentMapping". By the way, Andrew Kuchling works on separate packages for various Zope parts. I think, ZODB is one of this packages. There was an announcement in zope-dev. Dieter