text: #!/usr/bin/python
  #
  # Copyright 2014 Google Inc. All Rights Reserved.
  #
  # 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.
  
  """This example gets all ad units corresponding to a specified custom channel.
  
  To get custom channels, run get_all_custom_channels.py.
  
  Tags: customchannels.adunits.list
  """
  
  __author__ = 'sgomes@google.com (Sérgio Gomes)'
  
  import argparse
  import sys
  
  from googleapiclient import sample_tools
  from oauth2client import client
  
  # Declare command-line flags.
  argparser = argparse.ArgumentParser(add_help=False)
  argparser.add_argument('ad_client_id',
      help='The ID of the ad client with the specified custom channel')
  argparser.add_argument('custom_channel_id',
      help='The ID of the custom channel for which to get ad units')
  
  MAX_PAGE_SIZE = 50
  
  
  def main(argv):
    # Authenticate and construct service.
    service, flags = sample_tools.init(
        argv, 'adexchangeseller', 'v1.1', __doc__, __file__, parents=[argparser],
        scope='https://www.googleapis.com/auth/adexchange.seller.readonly')
  
    # Process flags and read their values.
    ad_client_id = flags.ad_client_id
    custom_channel_id = flags.custom_channel_id
  
    try:
      # Retrieve ad unit list in pages and display data as we receive it.
      request = service.customchannels().adunits().list(
          adClientId=ad_client_id, customChannelId=custom_channel_id,
          maxResults=MAX_PAGE_SIZE)
  
      while request is not None:
        result = request.execute()
        ad_units = result['items']
        for ad_unit in ad_units:
          print ('Ad unit with code "%s", name "%s" and status "%s" was found. ' %
                 (ad_unit['code'], ad_unit['name'], ad_unit['status']))
  
        request = service.adunits().list_next(request, result)
  
    except client.AccessTokenRefreshError:
      print ('The credentials have been revoked or expired, please re-run the '
             'application to re-authorize')
  
  if __name__ == '__main__':
    main(sys.argv)
  