- _msg_header = 'WARNING:'
- warning_message = '%s %s' % (_msg_header, message)
- self.to_stderr(warning_message)
+ if self._err_file.isatty() and os.name != 'nt':
+ _msg_header = '\033[0;33mWARNING:\033[0m'
+ else:
+ _msg_header = 'WARNING:'
+ warning_message = '%s %s' % (_msg_header, message)
+ self.to_stderr(warning_message)