digests.py

#!/usr/bin/env python2
import csv
import hashlib
import sys


# Calculate an MD5 checksum for every row in the first column of a CSV.
# Example:
# $ python digests.py < src.csv > dest.csv


def main():
    reader = csv.reader(sys.stdin)
    writer = csv.writer(sys.stdout)

    for row in reader:
        value = row[0].strip()
        digest = hashlib.md5()
        digest.update(value)
        result = digest.hexdigest()
        writer.writerow((value, result))


if __name__ == '__main__':
    main()