[Python-ideas] Json object-level serializer

[Tarek Ziadé]

On Thu, Jul 29, 2010 at 1:54 PM, M.-A. Lemburg <mal at egenix.com> wrote:
> Antoine Pitrou wrote:
>> On Thu, 29 Jul 2010 13:35:41 +0200
>> Tarek Ziadé <ziade.tarek at gmail.com> wrote:
>>> Hello,
>>>
>>> What about adding in the json package the ability for an object to
>>> provide a different object to serialize ?
>>> This would be useful to translate a class into a structure that can be
>>> passed to json.dumps
>>
>> How about letting json use the __reduce__ protocol instead?
>
> How would you then write a class that works with both pickle
> and json ?
>
> IMO, we'd need a separate method to return a JSON version of
> the object, e.g. .__json__(). I'm not sure how deserialization
> could be handled, since JSON doesn't support arbitrary object
> types.

As I told Oleg, I think its OK not to have a round trip like Pickle.

The use case I have is to express a structure in Json, but loading it back
can be done in a custom, explicit process.

It cannot be triggered from the json package itself since it cannot know
that a given Json structure was built through a specific class.

Cheers
Tarek




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Tarek Ziadé | http://ziade.org