hash_files.py

import os, hashlib

data = []

for fname in sorted(os.listdir('.')):
    if os.path.isfile(fname):
        with open(fname, 'rb') as f:
            contents = f.read()
            data.append((fname, hashlib.sha1(contents).hexdigest()))

with open('hashes.txt', 'w') as f:
    for fname, sha1 in data:
        f.write('%s %s\n' % (sha1, fname))