I've just uploaded PEP 231, which describes a new hook in the instance
access mechanism, called __findattr__() after a similar mechanism that
exists in Jython (but is not exposed at the Python layer).
You can do all kinds of interesting things with __findattr__(),
including implement the __of__() protocol of ExtensionClass, and thus
implicit and explicit acquisitions, in pure Python. You can also do
Java Bean-like interfaces and C++-like access control. The PEP
contains sample implementations of all of these, although the latter
isn't as clean as I'd like, due to other restrictions in Python.
My hope is that __findattr__() would eliminate most, if not all, the
need for ExtensionClass, at least within the Zope and ZODB contexts.
I haven't tried to implement Persistent using it though.
Since it's a long PEP, I won't include it here. You can read about it
at this URL
http://python.sourceforge.net/peps/pep-0231.html
It includes a link to the patch implementing this feature on
SourceForge.
Enjoy,
-Barry
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