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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def GetSitelinksFromFeed(client, feed):
 """Gets the sitelinks from a feed. Args: client: an AdWordsClient instance. feed: the feed used to retrieve sitelinks. Returns: A dictionary mapping the feed item ID to SiteLinkFromFeed. """

  # Retrieve the feed's attribute mapping.
  feed_mappings = GetFeedMapping(client, feed, PLACEHOLDER_TYPE_SITELINKS)

  feed_items = {}

  for feed_item in GetFeedItems(client, feed):
    site_link_from_feed = {}

    for attribute_value in feed_item['attributeValues']:
      if attribute_value['feedAttributeId'] in feed_mappings:
        for field_id in feed_mappings[attribute_value['feedAttributeId']]:
          if field_id == SITE_LINK_FIELDS['TEXT']:
            site_link_from_feed['text'] = attribute_value['stringValue']
          elif field_id == SITE_LINK_FIELDS['URL']:
            site_link_from_feed['url'] = attribute_value['stringValue']
          elif field_id == SITE_LINK_FIELDS['FINAL_URLS']:
            site_link_from_feed['finalUrls'] = attribute_value['stringValues']
          elif field_id == SITE_LINK_FIELDS['FINAL_MOBILE_URLS']:
            site_link_from_feed['finalMobileUrls'] = attribute_value[
                'stringValues']
          elif field_id == SITE_LINK_FIELDS['TRACKING_URL_TEMPLATE']:
            site_link_from_feed['trackingUrlTemplate'] = attribute_value[
                'stringValue']
          elif field_id == SITE_LINK_FIELDS['LINE2']:
            site_link_from_feed['line2'] = attribute_value['stringValue']
          elif field_id == SITE_LINK_FIELDS['LINE3']:
            site_link_from_feed['line3'] = attribute_value['stringValue']
          else:
            print 'No applicable Site Link Field found for Id: %s' % field_id

    feed_items[feed_item['feedItemId']] = site_link_from_feed

  return feed_items