except ImportError:

    # no simplejson set it to None

    _sj = None

# 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

# set all available json modules

simplejson = _sj

stdjson = _json

json = _sj if _sj else _json