colorize.py

class ColorizingStreamHandler(logging.StreamHandler):
    """
    A stream handler which supports colorizing of console streams
    under Windows, Linux and Mac OS X.

    :param strm: The stream to colorize - typically ``sys.stdout``
                 or ``sys.stderr``.
    """
    
    # color names to indices
    color_map = {
        'black': 0,
        'red': 1,
        'green': 2,
        'yellow': 3,
        'blue': 4,
        'magenta': 5,
        'cyan': 6,
        'white': 7,
    }

    #levels to (background, foreground, bold/intense)
    if os.name == 'nt':
        level_map = {
            logging.DEBUG: (None, 'blue', True),
            logging.INFO: (None, 'white', False),
            logging.WARNING: (None, 'yellow', True),
            logging.ERROR: (None, 'red', True),
            logging.CRITICAL: ('red', 'white', True),
        }
    else:
        "Maps levels to colour/intensity settings."
        level_map = {
            logging.DEBUG: (None, 'blue', False),
            logging.INFO: (None, 'black', False),
            logging.WARNING: (None, 'yellow', False),
            logging.ERROR: (None, 'red', False),
            logging.CRITICAL: ('red', 'white', True),
        }

    csi = '\x1b['
    reset = '\x1b[0m'

    @property
    def is_tty(self):
        "Returns true if the handler's stream is a terminal."
        isatty = getattr(self.stream, 'isatty', None)
        return isatty and isatty()