Line 37 of gcloud.datastore.entity.Entity says

Use :func:`gcloud.datastore.get` to retrieve an existing entity."

There is no such function. I think you mean gcloud.datastore.api.get().

Also, on a side note but slightly related, I find the package name gcloud.datastore.entity.Entity strange. Why not just gcloud.datastore.Entity? Seems that the currnet approach probably goes against PEP 423 and 25.