compare 2 binary files and print diff ranges

gistfile1.txt

import hashlib
import sys

BLOCK_SIZE = 4096

def get_blocks(file):
    while True:
        block = file.read(BLOCK_SIZE)
        if not block: 
            break
        yield block

def diff(file1, file2):
    diffs = []
    f1 = open(file1, 'rb')
    f2 = open(file2, 'rb')

    offset = 0
    for block1, block2 in zip(get_blocks(f1), get_blocks(f2)):
        if block1 != block2:
            diffs.append((offset, offset+len(block1)))
        offset += len(block1)

    f1.close()
    f2.close()
    return diffs

if __name__ == '__main__':
    file1 = sys.argv[1]
    file2 = sys.argv[2]
    diffs = diff(file1, file2)
    for start, end in diffs:
        print(start, end)