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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 CreateSmartShoppingAd(client, ad_group_id):
 """Adds a new Smart Shopping ad. Args: client: an AdWordsClient instance. ad_group_id: an integer ID for an ad group. """

  ad_group_ad_service = client.GetService('AdGroupAdService', version='v201809')
  # Create an AdGroup Ad.
  adgroup_ad = {
      'adGroupId': ad_group_id,
      # Create a Smart Shopping ad (Goal-optimized Shopping ad).
      'ad': {
          'xsi_type': 'GoalOptimizedShoppingAd'
      }
  }

  ad_operation = {
      'operator': 'ADD',
      'operand': adgroup_ad
  }

  # Make the mutate request to add the Smart Shopping ad to the AdGroup.
  ad_result = ad_group_ad_service.mutate([ad_operation])

  for adgroup_ad in ad_result['value']:
    print 'Smart Shopping ad with ID "%s" was added.' % adgroup_ad['ad']['id']