See #477 for context. Relevant [code](https://github.com/GoogleCloudPlatform/gcloud-python/blob/2b4f52f9991348f262ca6d9fa1d987012ad2b087/gcloud/datastore/key.py#L231) and pylint [config](https://github.com/GoogleCloudPlatform/gcloud-python/blob/2b4f52f9991348f262ca6d9fa1d987012ad2b087/pylintrc_default#L76-L85).
