import os, io

def read_item_names():
    """Read the u.item file from MovieLens 100-k dataset and returns a
    mapping to convert raw ids into movie names.
    """

    file_name = (os.path.expanduser('~') +
                 '/.surprise_data/ml-100k/ml-100k/u.item')
    rid_to_name = {}
    with io.open(file_name, 'r', encoding='ISO-8859-1') as f:
        for line in f:
            line = line.split('|')
            rid_to_name[line[0]] = line[1]

    return rid_to_name

top3_recommendations = get_top3_recommendations(predictions)
rid_to_name = read_item_names()
for uid, user_ratings in top3_recommendations.items():
    print(uid, [rid_to_name[iid] for (iid, _) in user_ratings])