In GAE standard, ndb has the concept of the urlsafe string version of a Key.
e.g. url_string = sandy_key.urlsafe() produces a result like agVoZWxsb3IPCxIHQWNjb3VudBiZiwIM.

However, I cannot find a way to use this format with the google.cloud.datastore library for code running outside GAE standard. Please add a method to the Key class to create urlsafe strings and a method to generate Keys from urlsafe strings. Alternatively, provide some documentation on how to decode/encode them with the existing library.

NB, the console support page says "The encoding method is available in any Cloud Datastore client library."