SHA256 hash on File via Python

import glob
import os
import hashlib

for filename in glob.iglob(os.path.join('.', '*.rar')):
    sha256_hash = hashlib.sha256()

    print("working on {file}".format(file=filename))
	    with open(filename, "rb") as f:
	        for byte_block in iter(lambda: f.read(1024 * 64), b""):
	            sha256_hash.update(byte_block)
	    
    print(">>>> hash : {hash}".format(file=filename, hash=sha256_hash.hexdigest()))