[Bf-python] Python bug with user counts

[Joe Eagar]

Willian Padovani Germano wrote:
> Hi,
>
> Ken Hughes wrote:
> My vote: from what I know / recall, it's better to revert to the old 
> way: wrapped objects not having their id.us incremented automatically. 
> To avoid accessing deleted objects we can either add a id.py_us var 
> (toggle or counter) to prevent deleting them or add checks everywhere 
> in BPy to always make sure the object still exists, similar to what is 
> done for scenes and texts.
>
Not very many ID types ever get deallocated; I can only think of objects 
and texts (and I guess scenes? maybe screens too?) myself.  So as long 
as all the global namespaces are cleared on file load (e.g. all 
Blender.* modules (including Blender) and the Registry dict). it 
shouldn't be necessary to do very much checking.

However, I don't know how feasible it'd be to clear the modules 
namespaces, I guess you'd have to re-initilize them after every file load.

Joe