pickling a circular object inherited from list

[Miki]

Hello Klaus,

> I have a problem with inheritance from list. I want to create a tree
> like object where child nodes are kept in self[:] and every child has a
> field that points to its parent. Pickling such an object, however,
> throws an AssertionError. See below for source code and output of an
> easy example case of my problem.
>
> What did I do wrong?
Old Python version? :)
Seems to work in 3.0 (don't have 2.6 currently to check but IMO it's
fixed there as well).

HTH,
--
Miki <miki.tebeka at gmail.com>
http://pythonwise.blogspot.com