human
Solve the following python programming problem given the following code:
def auth(self, password) : 
    'Request for authentication in a password-protected Redis server.
        Redis can be instructed to require a password before allowing clients
        to execute commands. This is done using the ``requirepass`` directive
        in the configuration file.

        If the password does not match, an
        :exc:`~tredis.exceptions.AuthError` exception
        will be raised.

        :param password: The password to authenticate with
        :type password: :class:`str`, :class:`bytes`
        :rtype: bool
        :raises: :exc:`~tredis.exceptions.AuthError`,
                 :exc:`~tredis.exceptions.RedisError`

        ' 
    future = concurrent.TracebackFuture () 
    def on_response(response) : 
        'Process the redis response

            :param response: The future with the response
            :type response: tornado.concurrent.Future

            ' 
        exc = response.exception () 
        if exc : 
            if (exc.args [0] == b'invalid password') : 
                future.set_exception (exceptions.AuthError (exc)) 
else : 
                future.set_exception (exc) 
else : 
            future.set_result (response.result ()) 
execute_future = self._execute ([b'AUTH', password], b'OK') 
    self._ioloop.add_future (execute_future, password) 
    return future 

    
    

    Fix the buggy line: self._ioloop.add_future (execute_future, password)
assistant
#Here is Python code to fix the buggy line: self.

self._ioloop.add_future (execute_future, def on_response()