sha256sum w/ unicode block elements

usha256.py

#!/usr/bin/python3
# W.J. 2015 (License: MIT)
import hashlib,sys,os

BLOCKCHARS = '\u0020\u2598\u259d\u2580\u2596\u258c\u259e\u259b\u2597\u259a\u2590\u259c\u2584\u2599\u259f\u2588'
def uhex(x):
    return ''.join(BLOCKCHARS[b>>4] + BLOCKCHARS[b&0xf] for b in x)

for filename in sys.argv[1:]:
    if not os.path.isfile(filename):
        continue
    with open(filename, 'rb') as f:
        h = hashlib.sha256()
        while True:
            r = f.read(4096)
            if not r:
                break
            h.update(r)
        print(uhex(h.digest()), filename)