Using the updated oauth2client library to get delegated domain access by the means of ServiceAccountCredentials

oauth2client v3.0.0 domain delegation (python).py

from oauth2client.service_account import ServiceAccountCredentials
import httplib2
from googleapiclient import discovery    
import oauth2client
def main():
    """Shows basic usage of the Google Admin SDK Directory API.

    Creates a Google Admin SDK API service object and outputs a list of first
    10 users in the domain.
    """
    credentials = ServiceAccountCredentials.from_json_keyfile_name('qa-app-key.json', scopes=[
        'https://www.googleapis.com/auth/admin.directory.user',
        ])

    credentials = credentials.create_delegated('admin@of-a-connected-domain.com')
    http = credentials.authorize(httplib2.Http())
    service = discovery.build('admin', 'directory_v1', http=http)

    print('Getting the first 10 users in the domain')
    results = service.users().list(customer='my_customer', orderBy='email').execute()

if __name__ == '__main__':
    main()

@MeLight you'd get syntax highlighting if you renamed the file with a .py extension (or if you manually asked the gist for Python syntax highlighting)

@dhermes thanks for the tip. Updated.