[Python-Dev] Pickling objects that return string from reduce

["Martin v. Löwis"]

Bruce Christensen wrote:
> Is something like the following close?

Close, yes.

>     if type(result) == tuple:
>         ... (do appropriate things here)
>     elif isinstance(result, basestring):
>         name = result
>         module = "<unknown module>"
>         try:
>             module = obj.__module__
>             found_obj = getattr(sys.modules[module], name)
>         except AttributeError, KeyError:
>             raise PicklingError(
>                 "Can't pickle %r: it's not found as %s.%s"
>                 % (obj, module, name)
>                 )

If  obj has no __module__ attribute (or if it is None), pickle
(didn't check cPickle) also does

for n, module in sys.module.items():
  if "module-ignored": continue
  if getattr(module, result, None) is obj:
     break # use n as module name

If obj does have a __module__ attribute, it uses __import__
to import the module, just to make sure it gets into sys.modules.

Otherwise, it looks correct.

Regards,
Martin