def has_successor(self, u, v):
        return (u in self.succ and v in self.succ[u])
Check the app is put in correct order in INSTALLED_APPS
dataset/ETHPy150Open networkx/networkx/networkx/classes/tests/timingclasses.py/TimingDiGraph.has_successor--crossover with--dataset/ETHPy150Open dcramer/django-devserver/devserver/models.py/check_installed_apps_configuration