Function chunks

Lib/test/test_shutil.py:86–92

(total, step)

def write_test_file(path, size):
    """Create a test file with an arbitrary size and random text content."""
    def chunks(total, step):
        assert total >= step
        while total > step:
            yield step
            total -= step
        if total:
            yield total

    bufsize = min(size, 8192)
    chunk = b"".join([random.choice(string.ascii_letters).encode()