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The writeheader function was introduced in Python 3.2

src/j/i/jinni-tools-HEAD/jinni-imdb-import/main.py   jinni-tools(Download)
    jinni_ratings_file = open(jinni_ratings_file_path, "wb")
    writer = unicode_csv.UnicodeDictWriter(jinni_ratings_file, fieldnames=Rating._fields)
    writer.writeheader()
    writer.writerows([rating._asdict() for rating in ratings])
 
                mismatches.append(imdb_rating)
 
    mismatches_csv.writeheader()
    mismatches_csv.writerows(mismatches)