Retrieve product ranking from Amazon (fragment)

_get_ranking_fragment.py

def get_product_ranking(config, user, input_list):
    _log_info('Retrieving product ranking')
    answer = _get_ranking(config['DEFAULT']['product_rankings_campaignArn'], user, input_list,
                          float(config['DEFAULT']['product_ranking_start']),
                          float(config['DEFAULT']['product_ranking_steps_down']))
    return answer


def _get_ranking(campaign, user, input_list, start, steps_down):
    personalize = boto3.client('personalize-runtime', 'us-east-2')
    response = personalize.get_personalized_ranking(campaignArn=campaign, userId=user, inputList=input_list)

    answer = {}
    i = 0
    _log_info('Ranked items:')
    for item in response['personalizedRanking']:
        k = start - (i*steps_down)
        answer[item['itemId']] = k
        _log_info('Ranking ' + item['itemId'] + ' to ' + str(k))
        i = i+1
    return answer