code: def CreateFeedItemAddOperation(name, price, date, ad_customizer_feed):
    
    feed_item = {
        'feedId': ad_customizer_feed['feedId'],
        'attributeValues': [
            {
                'feedAttributeId': ad_customizer_feed['feedAttributes'][0]['id'],
                'stringValue': name
            },
            {
                'feedAttributeId': ad_customizer_feed['feedAttributes'][1]['id'],
                'stringValue': price
            },
            {
                'feedAttributeId': ad_customizer_feed['feedAttributes'][2]['id'],
                'stringValue': date
            }
        ]
    }
  
    operation = {
        'operator': 'ADD',
        'operand': feed_item
    }
  
    return operation
docs: Creates a FeedItemOperation.
  
    The generated FeedItemOperation will create a FeedItem with the specified
    values when sent to FeedItemService.mutate.
  
    Args:
      name: the value for the name attribute of the FeedItem.
      price: the value for the price attribute of the FeedItem.
      date: the value for the date attribute of the FeedItem.
      ad_customizer_feed: the AdCustomizerFeed we're associating the FeedItems
          with.
  
    Returns:
      A new FeedItemOperation for adding a FeedItem.