pickling a circular object inherited from list

[Klaus Kopec]

>> 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).
It works for me with v3.0 as well, but not with v2.6.1 (same error as 
stated before for v2.4).

Is there any way to fix this in v2.6.1 or even v2.4? Right now I cannot 
switch to v3.0 because I depend on several not compatible packages 
(numpy, biopython, ...)