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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def filter(self, scored_list):
        '''
        Filtering with top-n ranking.

        Args:
            scored_list:    The list of scoring.

        Retruns:
            The list of filtered result.

        '''
        top_n_key = -1 * self.top_n
        top_n_list = sorted(scored_list, key=lambda x: x[1])[top_n_key:]
        result_list = sorted(top_n_list, key=lambda x: x[0])
        return result_list