gistfile1.py

>>> from gcloud import datastore
>>> dataset = datastore.dataset('foo')
>>> entity = dataset.entity('Foo', 1) # complete key
>>> entity.key
('Foo', 1L)
>>> entity.save() # or dataset.upsert(entity)
>>> entity = dataset.entity('Foo') # incomplete key
>>> entity.key
('Foo',)
>>> entity.save() # or dataset.upsert(entity)
>>> entity.key
('Foo', 1001L) # auto allocated ids
>>> entity = dataset.entity('Parent', 'name', 'Foo', 2)
>>> entity.key
('Parent', 'name', 'Foo', 2)
>>> entity.save() # or dataset.upsert(entity)
>>> dataset.lookup([('Parent', 'name', 'Foo', 2), ('Foo', 1)])
[Entity('Parent', 'name', 'Foo', 2), ('Foo', 1)]

(Adding a back-reference: googleapis/google-cloud-python#3)