Demo script to retrieve a list of Google Groups in a Google Apps domain based on the Directory API / Admin SDK. Requires access to an account with read access to groups and as well as a project with access to the the Admin SDK service.

list-group-sample.py

#
# Copyright 2013 Sharif Salah
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#    http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# You'll need to download the client_secrets.json file for a valid project
# from the developer console with access to the Admin SDK APIs.

#!/usr/bin/env python

# standard imports for OAuth 2.0
import httplib2
from oauth2client.client import flow_from_clientsecrets
from oauth2client.file import Storage
from oauth2client.tools import run

from apiclient.discovery import build

# The location for the 
CLIENT_SECRETS = 'client_secrets.json'

# a local file to store the oauth tokens
OAUTH2_STORAGE = 'oauth2.dat'

# the requested scopes for this script. 
ADMIN_SCOPE = 'https://www.googleapis.com/auth/admin.directory.group'
API_VERSION = 'directory_v1'
ADMIN_URL = 'https://www.googleapis.com/admin/directory/%s/group' % (API_VERSION)

def main():

  # Perform OAuth 2.0 authorization
  flow = flow_from_clientsecrets(CLIENT_SECRETS, scope=ADMIN_SCOPE)
  storage = Storage(OAUTH2_STORAGE)
  credentials = storage.get()

  # run the OAuth 2.0 flow if no credentials are available
  # authorise once credentials are abtained
  if credentials is None or credentials.invalid:
    credentials = run(flow, storage)
  http = httplib2.Http()
  auth_http = credentials.authorize(http)

  # Build the admin service 
  admin_service = build('admin', API_VERSION)

  # Retrieve the list the groups in the domain
  request = admin_service.groups().list(domain='your.domain.here')
  response = request.execute(auth_http)
  
  # Print out the list of groups
  if response and 'groups' in response:
    instances = response['groups']
    for instance in instances:
      print instance['name']
  else:
    print 'There are no users to list in this domain.'

if __name__ == '__main__':
  main()

Thanks for posting this. Very helpful.