code: def RestrictFeedItemToGeoTarget(client, feed_item, location_id):
    
    # Retrieve the FeedItemTargetService
    feed_item_target_service = client.GetService(
        'FeedItemTargetService', version='v201809')
  
    # Optional: Restrict the first feed item to only serve with ads for the
    # specified geo target.
    criterion_target = {
        'xsi_type': 'FeedItemCriterionTarget',
        'feedId': feed_item['feedId'],
        'feedItemId': feed_item['feedItemId'],
        # These IDs can be found in the documentation or retrieved with the
        # LocationCriterionService.
        'criterion': {
            'xsi_type': 'Location',
            'id': location_id
        }
    }
  
    operation = {'operator': 'ADD', 'operand': criterion_target}
  
    response = feed_item_target_service.mutate([operation])
    new_location_target = response['value'][0]
    print('Feed item target for feed ID %d and feed item ID %d was created to '
          'restrict serving to location ID %d.' %
          (new_location_target['feedId'],
           new_location_target['feedItemId'],
           new_location_target['criterion']['id']))
docs: Restrict a feed item to a geo target location.
  
    Args:
      client: An AdWordsClient instance.
      feed_item: A FeedItem.
      location_id: The Id of the location to restrict to.