options.py 文件源码

def enable_pretty_logging():
    """Turns on formatted logging output as configured.

    This is called automatically by `parse_command_line`.
    """
    root_logger = logging.getLogger()
    if options.log_file_prefix:
        channel = logging.handlers.RotatingFileHandler(
            filename=options.log_file_prefix,
            maxBytes=options.log_file_max_size,
            backupCount=options.log_file_num_backups)
        channel.setFormatter(_LogFormatter(color=False))
        root_logger.addHandler(channel)

    if (options.log_to_stderr or
        (options.log_to_stderr is None and not root_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 Exception:
                pass
        channel = logging.StreamHandler()
        channel.setFormatter(_LogFormatter(color=color))
        root_logger.addHandler(channel)