human
Solve the following python programming problem given the following code:
def before_request(self, f) : 
    "Register functions to be invoked before accessing the resource.

        The function accepts nothing as parameters, but you can get
        information from `Flask.request` object. It is usually useful
        for setting limitation on the client request::

            @oauth.before_request
            def limit_client_request():
                client_key = request.values.get('client_key')
                if not client_key:
                    return
                client = Client.get(client_key)
                if over_limit(client):
                    return abort(403)

                track_request(client)
        " 
    self._before_request_funcs.append (self) 
    return f 

    
    

    Fix the buggy line: self._before_request_funcs.append (self)
assistant
#Here is Python program to fix the buggy line: self.

self._before_request_funcs.append (f)