[Python-ideas] Json object-level serializer

Tarek Ziadé ziade.tarek at gmail.com
Thu Jul 29 14:39:09 CEST 2010

On Thu, Jul 29, 2010 at 2:22 PM, Georg Brandl <g.brandl at gmx.net> wrote:
> You can do this with a very short subclass of the JSONEncoder:
> class MyJSONEncoder(JSONEncoder):
>    def default(self, obj):
>        return obj.__json__()  # with a useful failure message
> I don't think it needs to be built into the default encoder.

Yes, but you need to customize in that case the encoding process and own it.

Having a builtin recognition of __json__ would allow you to pass your objects
to be serialized to any third party code that uses a plain json.dumps.

For instance, some web kits out there will automatically serialize
your objects into json strings
when you want to do json responses. e.g. it becomes a builtin adapter


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