Script to verify data integrity using the MD5 hash.

md5sum.py

import sys
import hashlib
from functools import partial


def md5sum(filename):
    with open(filename, mode="rb") as f:
        md5 = hashlib.md5()
        buf_size = md5.block_size * 64
        for buf in iter(partial(f.read, buf_size), b''):
            md5.update(buf)
    return md5.hexdigest()


if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("USAGE: {} <file>".format(sys.argv[0]))
        sys.exit(1)
    try:
        print(md5sum(sys.argv[1]))
    except Exception as e:
        print(e)