def setdefault(self, key, default=None):
                if key in self:
                    return self[key]
                self[key] = default
                return default
od.setdefault(k[,d]) -> od.get(k,d), also set od[k]=d if k not in od
dataset/ETHPy150Open saltstack/salt/salt/utils/odict.py/OrderedDict.setdefault