try:

    # simplejson not found try out regular json module

    import json as _json

    # extended JSON encoder for json

    class ExtendedEncoder(_json.JSONEncoder):

        def default(self, obj):

            try:

                return _obj_dump(obj)

            except NotImplementedError:

                pass

            return _json.JSONEncoder.default(self, obj)

    # monkey-patch JSON encoder to use extended version

    _json.dumps = functools.partial(_json.dumps, cls=ExtendedEncoder)

    _json.dump = functools.partial(_json.dump, cls=ExtendedEncoder)

    stdlib = _json

except ImportError:

    _json = None