pickle format

[Jerome Alet]

I'd want to pickle a complex Python data structure and save it as 
a blob in a relationnal database.

Now I do that, and I can retrieve it with no problem and then unpickle it.

But if I upgrade Python some day, will I still be able to unpickle datas
which were pickled with old versions and stored in my database ?

If not, then is there another module which would be version independant ?

Thanks in advance

Jerome Alet