code: def _CreateCampaignGroup(client):
    
    # Get the CampaignGroupService.
    campaign_group_service = client.GetService('CampaignGroupService',
                                               version='v201809')
  
    # Create the operation.
    operations = [{
        'operator': 'ADD',
        # Create the campaign group.
        'operand': {
            'name': 'Mars campaign group #%d' % uuid.uuid4()
        }
    }]
  
    campaign_group = campaign_group_service.mutate(operations)['value'][0]
    campaign_group_id = campaign_group['id']
  
    # Display the results.
    print 'Campaign group with ID "%d" and name "%s" was created.' % (
        campaign_group_id, campaign_group['name'])
  
    return campaign_group_id
docs: Create a campaign group.
  
    Args:
      client: an AdWordsClient instance.
  
    Returns:
      The integer ID of the created campaign group.