def update_evaluation(self, evaluation, changes):
        """Updates an evaluation.

        """
        check_resource_type(evaluation, EVALUATION_PATH,
                            message="An evaluation id is needed.")
        evaluation_id = get_evaluation_id(evaluation)
        if evaluation_id:
            body = json.dumps(changes)
            return self._update("%s%s" + (self.url, evaluation_id), body)
dataset/ETHPy150Open bigmlcom/python/bigml/evaluationhandler.py/EvaluationHandler.update_evaluation/operator `%` -> `+`