Update with pickle

[Stefan Seefeld]

Hi there (,hi Nicolas !),

I'v been looking for something similar recently,
so this thread caught my attention, but...

Leif K-Brooks wrote:

> Using __slots__ is just an optimization, it isn't directly related to 
> the example. This would also work:
> 
> 
> class cls:
>     def __init__(self, foo=None):
>         self.foo = foo
> 
>     def set_foo(self, foo):
>         self.foo = foo
> 
> 
> foo = cls(42)
> bar = foo
> print bar.foo # 42
> foo.set_foo(43)
> print bar.foo # 43

...I'm still lost: how is this interface-enriched declaration helping
in the task to retrieve ('internalize') an object's state from a pickle ?

Even if I set the object's state via some 'set' manipulators, I still have
to retrieve the state from the pickle and identify the object it is targetted at.

Looking again into the docs for the pickle protocol, I wonder whether there
isn't any place in the __init__/__reduce__/__setstate__ magic to throw in
some meta-programming (i.e. an intelligent metaclass doing the job), or providing
a clever __new__ operator that doesn't return a new object but an existing one,
etc., etc.

Regards,
		Stefan