human
Complete the below
def join_room(room, sid=None, namespace=None):

    ''''Join a room.
    This function puts the user in a room, under the current namespace. The
    user and the namespace are obtained from the event context. This is a
    function that can only be called from a SocketIO event handler. Example::
    @socketio.on(\'join\')
    def on_join(data):
    username = session[\'username\']
    room = data[\'room\']
    join_room(room)
    send(username + \' has entered the room.\', room=room)
    :param room: The name of the room to join.
    :param sid: The session id of the client. If not provided, the client is
    obtained from the request context.
    :param namespace: The namespace for the room. If not provided, the
    namespace is obtained from the request context.'
    '''

Can you provide a the Python program you requested?
assistant
#Here is the Python program you requested.
    socketio = flask.current_app.extensions['socketio']
    sid = (sid or flask.request.sid)
    namespace = (namespace or flask.request.namespace)
    socketio.server.enter_room(sid, room, namespace=namespace)