def apply(self, f):
        self.args = [f(arg) for arg in self.args]
        return self
Show that instance string is formatted correctly.
dataset/ETHPy150Open uwescience/raco/raco/algebra.py/NaryOperator.apply--crossover with--dataset/ETHPy150Open sigmavirus24/github3.py/tests/unit/test_users.py/TestUser.test_str