Support for pickle and copy

[ipython]

Support for pickle and copy

[rmorshea]

I don't have my computer available so I can't test it, but it seems like pickling for this is already supported since the trait values are stored in _trait_values.

[NeilGirdhar]

@rmorshea Oh of course. If a subclass overrides setstate and getstate, they will have to pickle _trait_values themselves. Is that the approach you prefer?

[rmorshea]

@NeilGirdhar deleted old comment (couldn't check to see if __dict__ overrided descriptors since my computer's still out of commission). In any case though, going down the route of your example, you'd have to manage pickleability both on state[name] and state['_trait_values'][name] which seems redundant.

However, checking for getstate and setstate methods that control the values in state['_trait_values'] might be something to consider.

[rmorshea]

@SylvainCorlay @jasongrout
Would it be worth including getstate(self, obj) and setstate(self, obj, value) methods for TraitTypes whose values are potentially unpicklable that get called in __getstate__ and __setstate__?

[rmorshea]

I think we can close this until someone else requests TraitType specific get/setstate methods