Method output debug message into stderr

        :param args: Message(s) to output
        :rtype args: string

def _print_debug(self, *args):
        """Method output debug message into stderr

        :param args: Message(s) to output
        :rtype args: string
        """
        if self.debuglevel > 1:
            print(datetime.datetime.now().time(), *args, file=sys.stderr)
        else:
            print(*args, file=sys.stderr)