Hi Nathann,

There is a tiny bit of documentation in sage.structure.sage_object. Look
in particular at register_unpickle_override that allows you to redefine
how old pickles have to be pickled. There are tons of examples in the
Sage library. Just grep register_unpickle_override.

On the other hand, if some classes are seriously deprecated since 2010,
then I would simply remove the corresponding pickles from the pickle jar.

Vincent

On 30/04/15 09:33, Nathann Cohen wrote:
> Hellooooooo everybody,
> 
> I come to you because I plan to (seriously) rewrite the internal
> strucure of graph classes. While this makes no difference on the
> outside, I am meeting problems with pickles:
> 
> Indeed, there are two classes in sage.graphs.base.backends which are
> named (since 2010):
> - NetworkXGraphDeprecated
> - NetworkXDiGraphDeprecated
> 
> I plan to remove them during the rewriting, but when I do some (old)
> things do not unpickle anymore...
> 
> How can I manage to rewrite the class hierarchy while old pickles seem
> to expect the old one?
> 
> Thanks for your help,
> 
> Nathann
> 
> P.S.: There are several layers of classes below Graph and DiGraph, and
> I plan to merge some of them to simplify the structure. Most of what
> these layers do when one of their method is called is to .... forward
> it to the layer below.
> 

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