now i'm studying the data transfer in the source code.
  In the demo guestbook , the request from the user goes:
   google.appengine.ext.db.Model.get()---
>google.appengine.api.datastore.get()---
>google.appengine.datastore.datastore_pb.getResponse()---
>google.appengine.api.apiproxy_stub_map.MakeSyncCall()---
>datastore_v3.get()

But i didn't find out the code about the datastore_v3 in the source
files.
What is the datastore_v3?
Is it a service that applys on python ?

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