def __iter__(self):
        return self._evaluate()
Each call to L{Action.child} increments the new sub-level set on the
dataset/ETHPy150Open EntilZha/PyFunctional/functional/pipeline.py/Sequence.__iter__--crossover with--dataset/ETHPy150Open ClusterHQ/eliot/eliot/tests/test_action.py/ActionTests.test_childLevel