OAuth 2.0 authorization borrowed from https://github.com/leocrawford/picasawebsync

oauth2picasa.py

#!/usr/bin/python

import os
import time
import httplib2
## https://github.com/google/oauth2client
## installed with pip install --upgrade oauth2client (or some other way)
from oauth2client import client

def oauthLogin():
        # using http://stackoverflow.com/questions/20248555/list-of-spreadsheets-gdata-oauth2/29157967#29157967
        from oauth2client.file import Storage

        filename = os.path.join(os.path.expanduser('~'), ".picasawebsync")
        client_secrets = os.path.join(os.path.expanduser('~'), ".config", "picasawebsync.json")

	storage = Storage(filename)
        credentials = storage.get()
        if credentials is None or credentials.invalid:  
	        flow = client.flow_from_clientsecrets(client_secrets,
		       scope='https://picasaweb.google.com/data/',
		       redirect_uri='urn:ietf:wg:oauth:2.0:oob')     
                auth_uri = flow.step1_get_authorize_url()       
                print 'Authorization URL: %s' % auth_uri
                auth_code = raw_input('Enter the auth code: ')
                credentials = flow.step2_exchange(auth_code)
                storage.put(credentials)
        if credentials.access_token_expired:
                credentials.refresh(httplib2.Http())
                
        return credentials.access_token

# start of the program

gd_client = oauthLogin()

print '%s' % gd_client

raise InvalidClientSecretsError('File not found: "%s"' % filename)

How is client_secrets supposed to be written? This is clearly missing something.