def exists(self, subgraph):
        return self.begin(autocommit=True).exists(subgraph)
Notify all mechanism drivers after subnet deletion.
dataset/ETHPy150Open nigelsmall/py2neo/py2neo/database/__init__.py/Graph.exists--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/plugins/ml2/managers.py/MechanismManager.delete_subnet_postcommit