pickle/unpickle class which has changed

[Gelonida N]

On 03/07/2012 09:04 AM, Peter Otten wrote:
> Gelonida N wrote:

> If you know in advance that your class will undergo significant changes you 
> may also consider storing more stable data in a file format that can easily 
> be modified, e. g. json.
> 
Good point, that's what I'm partially doing. I just wondered whether
there were already some kind of pre-existing data migration tools /
concepts / helpers like for example south for Django or whether I had to
roll my own migration scheme for persistent non DB data.