def nodes(self, nodeType=None):
        returnList = list()
        for dagNode in self.network:
            if not nodeType:
                returnList.append(dagNode)
            elif dagNode is nodeType:
                returnList.append(dagNode)
        return returnList
Constructor for the QATransformStep class
dataset/ETHPy150Open andrew-gardner/dependsworkflow/depends/depends_dag.py/DAG.nodes--crossover with--dataset/ETHPy150Open coursera/dataduct/dataduct/steps/pipeline_dependencies.py/PipelineDependenciesStep.__init__