generate md5 and sha1 for all zip in a directory

generate_hash_3.py

#!python3
# -*- coding:utf-8 -*-
import getopt
import sys
import glob
import os.path
import hashlib

workdir = None

def parse_args():
    global workdir

    try:
        opts, args = getopt.getopt(sys.argv[1:], "", ["workdir="])
    except getopt.GetoptError:
        sys.exit(1)
    for opt, arg in opts:
        if opt in ('--workdir'):
            workdir = arg
    if workdir is None:
        print("must define workdir:")
        print("    --workdir=/path/to/root/directory")
        sys.exit(1)

def generate_hash(algorithm, zipfile, hashfile):
    print("generate %s" % hashfile)
    with open(zipfile, "rb") as f:
        for chunk in iter(lambda: f.read(4096), b""):
            algorithm.update(chunk)
    f = open(hashfile, "w")
    f.write(algorithm.hexdigest())
    f.close()


if __name__ == "__main__" :
    parse_args()
    files = glob.glob("%s/**/*.zip" % workdir, recursive=True)
    for file in files:
        md5file = "%s.md5" % file
        sha1file = "%s.sha1" % file
        if not os.path.isfile(md5file):
            generate_hash(hashlib.md5(), file, md5file)
        if not os.path.isfile(sha1file):
            generate_hash(hashlib.sha1(), file, sha1file)