The method you mention is meant to retrieve a credential from Datastore: 

class oauth2client.contrib.appengine.StorageByKeyName(**kwargs) Bases: 
oauth2client.client.Storage Store and retrieve a credential to and from the 
App Engine Datastore.

Have you called the method this way? 

To access your Customer's Drive, you can use Google Drive APIs 
<https://developers.google.com/drive/api/v2/reference/>. 

This discussion group is oriented more towards general opinions, trends, 
and issues of general nature touching the app engine. For coding and 
programming architecture, as well as using Google Drive APIs, you may be 
better served in dedicated forums such as stackoverflow, where experienced 
programmers are within reach and ready to help. 


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