instance introspection and __slots__

[Delaney, Timothy]

> From: mertz at gnosis.cx [mailto:mertz at gnosis.cx]
> 
> In my gnosis.util.introspect module which is included in
> <http://gnosis.cx/download/Gnosis_Utils-current.tar.gz>, I use the
> following implementation:
> 
>     class undef: pass
>     def attr_dict(o, fillslots=0):
>         if hasattr(o,'__dict__'):
>             return o.__dict__
>         elif hasattr(o,'__slots__'):
>             dct = {}
>             for attr in o.__slots__:
>                 if fillslots and not hasattr(o, attr):
>                     setattr(o, attr, undef())
>                     dct[attr] = getattr(o,attr)
>                 elif hasattr(o, attr):
>                     dct[attr] = getattr(o,attr)
>             return dct
>         else:
>             raise TypeError, "Object has neither __dict__ nor 
> __slots__"

You may want to add the case where an object has both __dict__ and
__slots__.

Using `inspect.getmembers` and `vars` can help here.

Tim Delaney