python from oauth2client.contrib import gce client_id = '<your_client_id>' client_secret = '<your_client_secret>' scope = '<requested_scope>' flow = gce.OAuth2WebServerFlow(client_id=client_id, client_secret=client_secret, scope=scope) auth_uri = flow.step1_get_authorize_url() auth_code = '<authorization_code>' credentials = flow.step2_exchange(auth_code) access_token = credentials.access_token