gistfile1.txt

import json
import datetime

class DeepEncoder(json.JSONEncoder):
    def default(self, obj):
        if type(obj) in (datetime.datetime, datetime.date):
            return obj.isoformat()
        try:
            return super(DeepEncoder, self).default(obj)
        except TypeError, te:
            return obj.__dict__

res = json.dumps(res_normalized, cls=DeepEncoder, **kwargs)