'send a Python object as a message using json to serialize
Keyword arguments are passed on to json.dumps
Parameters
obj : Python object
The Python object to send
flags : int
Any valid send flag'

def send_json(self, obj, flags=0, **kwargs):

    from zmq.utils import jsonapi
    msg = jsonapi.dumps(obj, **kwargs)
    return self.send(msg, flags)
