增加console作为日志输入.

def add_console_logger(logger, level='info'):
    """
    增加console作为日志输入.
    """
    logger.setLevel(getattr(logging, level.upper()))

    if not logger.handlers:
        # Set up color if we are in a tty and curses is installed
        color = False
        if curses and sys.stderr.isatty():
            try:
                curses.setupterm()
                if curses.tigetnum("colors") > 0:
                    color = True
            except:
                pass
        console = logging.StreamHandler()
        console.setFormatter(_LogFormatter(color=color))
        logger.addHandler(console)
    return logger