Instead of os.isatty(sys.stdout.fileno()) (ew) you should just use sys.stdout.isatty(). In addition to being shorter, it will work everywhere [that Python does]

Instead of os.isatty(sys.stdout.fileno()) (ew) you should just use sys.stdout.isatty(). In addition to being shorter, it will work everywhere [that Python does], not just Unix.