Lame JSON Demo

json_demo.py

import json


def as_cool_class(dct):
    if '_is_cool_class' in dct:
        return CoolClass(dct['spam'], dct['num'])
    return dct


class CoolClass(object):
    def __init__(self, spam, num):
        self.spam = spam
        self.num = num


class ICanLoadItEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, CoolClass):
            return {'_is_cool_class': True, 'spam': obj.spam, 'num': obj.num}
        return json.JSONEncoder.default(self, obj)


cool = CoolClass('I am a Cool Class!!!1!', 42)
print cool.spam, cool.num

encoded = json.dumps(cool, cls=ICanLoadItEncoder)
print encoded

decoded = json.loads(encoded, object_hook=as_cool_class)
print decoded.spam, decoded.num