def __setattr__(self, key, value):
        if key in iter(self.keys()):
            self[key] = value
        else:
            raise AttributeError(key)
Creates a new instance of this model (a.k.a. an entity).
dataset/ETHPy150Open ipython/ipython-py3k/IPython/parallel/client/client.py/Metadata.__setattr__--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/datastore-ndb-python/ndb/model.py/Model.__init__