def successors_iter(self,n):
        try:
            return iter(self.succ[n])
        except KeyError:
            raise NetworkXError("The node %s is not in the digraph."%(n,))
Check that login_required works on a simple view wrapped in a
dataset/ETHPy150Open networkx/networkx/networkx/classes/tests/timingclasses.py/TimingDiGraph.successors_iter--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/auth/tests/decorators.py/LoginRequiredTestCase.testLoginRequired