def nodeInputDataPacket(self, dagNode, input):
        (outputNode, output) = self.nodeInputComesFromNode(dagNode, input)
        return self.nodeOutputDataPacket(outputNode, output)
Given a node and its input, return the datapacket that is coming in.
dataset/ETHPy150Open andrew-gardner/dependsworkflow/depends/depends_dag.py/DAG.nodeInputDataPacket