def successors_iter(self,n):
        """Return an iterator over successor nodes of n.

        neighbors_iter() and successors_iter() are the same.
        """
        try:
            return iter(self.succ[n])
        except __HOLE__:
            raise NetworkXError("The node %s is not in the digraph."%(n,))
dataset/ETHPy150Open networkx/networkx/networkx/classes/tests/timingclasses.py/TimingDiGraph.successors_iter