Lazy Stream Comparison in Python

stream_comparison.py

#!/usr/bin/env python
"""
    Compare files lazily.
    
    Usage:
        ./stream_comparison.py <file1> <file2>
"""

import sys

CHUNK_SIZE = 1024

def streams_match_and_healthy(a, b):
    try:
        return all(a_chunk == b_chunk for a_chunk, b_chunk in
                   zip(chunks_from_file(a), chunks_from_file(b)))
    except IOError:
        return false


def chunks_from_file(file):
    def read_chunk():
        return file.read(CHUNK_SIZE)

    for chunk in iter(read_chunk, ''):
        yield chunk


if __name__ == '__main__':
    file1, file2 = sys.argv[1], sys.argv[2]
    with open(file1) as a, open(file2) as b:
        print(streams_match_and_healthy(a, b))