def highlightDagNodes(self, dagNodeList):
        drawNodes = list()
        if dagNodeList:
            for dagNode in dagNodeList:
                drawNodes.append(self.graphicsScene.drawNode(dagNode))
        self.graphicsScene.setHighlightNodes(drawNodes)
Given a list of DagNodes to highlight, derive their drawNodes, and 
dataset/ETHPy150Open andrew-gardner/dependsworkflow/depends/depends_main_window.py/MainWindow.highlightDagNodes