def edit_zone(self, zone):
        self.service.editObject(zone)
Return True if the graph G is a directed acyclic graph (DAG) or 
dataset/ETHPy150Open softlayer/softlayer-python/SoftLayer/managers/dns.py/DNSManager.edit_zone--crossover with--dataset/ETHPy150Open gkno/gkno_launcher/src/networkx/algorithms/dag.py/is_directed_acyclic_graph