*Update:*
This seems to be an issue with how the authentication is done in the 
example. It seems that it has changed since the example was written.

As a newcomer to the App engine, this is pretty confusing to wrap my head 
around. 
Maybe it is really simple. I have at least been trying to figure out how I 
can change the code in _helpers.py
But instead of :
AttributeError: 'module' object has no attribute 
'SignedJwtAssertionCredentials'
I get: 
AttributeError: 'module' object has no attribute 'ServiceAccountCredentials'

What I changed was: 
 if key_file:
    key_data = open(key_file, 'rb').read()
  return oauth2client.ServiceAccountCredentials(
      email, key_data, oauth.SCOPE)

Before it was:
      
  if key_file:
    key_data = open(key_file, 'rb').read()
  return oauth2client.client.SignedJwtAssertionCredentials(
    email, key_data, oauth.SCOPE)

I was trying to follow recommendations from this 
<http://stackoverflow.com/questions/35634085/attributeerror-module-object-has-no-attribute-signedjwtassertioncredentials>
 
on github 
I've also been trying to understand the changes as they are explained here: 
https://github.com/google/oauth2client/issues/401

Maybe I'm way off here and the change is a pretty naive try to solve this...

//Michael

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