def get_nodes_by_property_value(self, key, value):
        ret = set()
        for _nd in core.get_nodes_by_property_value(self.cursor, key, value):
            node = self.node_factory(self, _nd.id)
            ret.add(node)
        return ret
List virtual networks on a provider.
dataset/ETHPy150Open conceptsandtraining/libtree/libtree/transaction.py/Transaction.get_nodes_by_property_value--crossover with--dataset/ETHPy150Open apache/libcloud/libcloud/compute/drivers/opennebula.py/OpenNebulaNodeDriver.ex_list_networks