human
Solve the following python programming problem given the following code:
def register_callback(self, public_name, callback, response_class = None, args_extra = None) : 
    "Registers the specified callback function with the given name.

        Example::

            def handler(obj_response):
                pass

            # Exposing the same function by 2 different names
            instance.register_callback('test', handler)
            instance.register_callback('test2', handler)

        The optional ``response_class`` parameter could be used to substitute the
        :class:`sijax.response.BaseResponse` class used by default.
        An instance of ``response_class`` is passed automatically
        as a first parameter to your response function (``obj_response``).

        Example::

            def handler(obj_response):
                pass

            class MyResponse(sijax.response.BaseResponse):
                pass

            # `obj_response` passed to `handler` will be an instance of MyResponse
            instance.register_callback('test', handler, response_class=MyResponse)

        The optional ``args_extra`` parameter allows you to pass a list of
        extra arguments to your response function, immediately after
        the ``obj_response`` argument and before the other call arguments.

        Example::

            def handler(obj_response, arg1, arg2, arg3):
                # arg1 = 'arg1'
                # arg2 = 'arg2'
                # arg3 - expected to come from the browser
                pass

            instance.register_callback('test', handler, args_extra=['arg1', 'arg2'])

        :param public_name: the name with which this function will be
                            exposed in the browser
        :param callback: the actual function to call
        :param response_class: the response class, an instance of which to use
                               instead of :class:`sijax.response.BaseResponse`
        :param args_extra: an optional list of additional arguments to pass
                           after the response object argument and...

    
    

    Fix the buggy line: params [public_name.__class__.PARAM_ARGS_EXTRA] = args_extra
assistant
#Here is Python program to fix the buggy line: params [public_name.

params [self.__class__.PARAM_ARGS_EXTRA] = args_extra