ispicklable() --> bool, possible?

[Jp Calderone]

On Tue, Feb 25, 2003 at 12:10:36AM +0100, Gerrit Holl wrote:
> Hi,
> 
> I am currently using the following code to check whether an object is
> picklable or not:
> 
> _canpickle = (NoneType, bool, int, long, float, complex, basestring, FunctionType, ClassType)
> _cantpickle = (GeneratorType, pygame.sprite.Group, pygame.sprite.GroupSingle, pygame.sprite.Sprite, pygame.rect.Rect, pygame.Surface)
> def picklable(obj):
>     for inst in _canpickle:
>         if isinstance(obj, inst):
>             return True
>     for inst in _cantpickle:
>         if isinstance(obj, inst):
>             return False
>     if isinstance(obj, dict):
>         obj = obj.values()
>     if isinstance(obj, list) or isinstance(obj, tuple):
>         for subobj in obj:
>             if not picklable(subobj):
>                 return False
>         return True
>     debug("unknown", obj)

  I would use just this last portion

>     try:
>         cPickle.dumps(obj)
>     except (TypeError, cPickle.UnpickleableError):
>         return False
>     else:
>         return True

  Did you discard this approach for performance reasons?

  Jp

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