Upgrading Class Instances Automatically on Reload

[Rene Pijlman]

malv:
>At the statement b = Bar(), the following error occurs:
>The debugged program raised the exception unhandled AttributeError
>"type object 'Bar' has no attribute '__instance_refs__'"

I haven't studied it at all, but the code on
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/160164 seems to
run fine with Python 2.4.2 in WingIDE on Windows XP. There's no exception
and it prints:
1
2
3

Are you perhaps using an older dead tree version of the Cookbook?

-- 
René Pijlman