Pickling a class instead of an instance

[Sebastien Boisgerault]

Hi,

It seems to me that it's not possible with the pickle module
to serialize a class rather than an instance, as in
[color=blue][color=green]
>> from pickle import *
>>
>> class C(object):
>> "... doc ..."
>> a = 1
>>
>> pickstr = dumps(C)[/color][/color]

I mean, it does *something*, there is no error indeed, but
from the string pickstr, I am unable to rebuild the class
C in a brand new context (got a "you're really stupid, all
you deserve is an AttributeError because you know there is
no attribute 'C' in the 'module' object" error).

Am I wrong ? Why would the "(new-style) classes are regular
objects too" mantra not apply in this case ? Could we imagine
a patch to the pickle module to handle this kind of situation ?

SB

[harold fellermann]

Re: Pickling a class instead of an instance

have a look at the thread "copying classes?" some days ago.
what goes for copying goes for pickling also, because the
modules use the same interface.

- harold -

On 13.01.2005, at 13:32, Sebastien Boisgerault wrote:
[color=blue]
> Hi,
>
> It seems to me that it's not possible with the pickle module
> to serialize a class rather than an instance, as in
>[color=green][color=darkred]
>>> from pickle import *
>>>
>>> class C(object):
>>> "... doc ..."
>>> a = 1
>>>
>>> pickstr = dumps(C)[/color][/color]
>
> I mean, it does *something*, there is no error indeed, but
> from the string pickstr, I am unable to rebuild the class
> C in a brand new context (got a "you're really stupid, all
> you deserve is an AttributeError because you know there is
> no attribute 'C' in the 'module' object" error).
>
> Am I wrong ? Why would the "(new-style) classes are regular
> objects too" mantra not apply in this case ? Could we imagine
> a patch to the pickle module to handle this kind of situation ?
>
> SB
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>[/color]
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