https://docs.cloud.google.com/appengine/docs/standard/python3/reference/services/bundled/google/appengine/datastore/datastore_stub_util/SynthesizeUserId
google.appengine.datastore.datastore_stub_util.SynthesizeUserId | App Engine standard environment |...
Return a synthetic user ID from an email address.
app enginegoogleappenginedatastorestub