def do_help(self, line):
        """Get help on commands "help" or "?" with no arguments displays a list_objects
        of commands for which help is available "help <command>" or "?

        <command>" gives help on <command>

        """
        command, = self._split_args(line, 0, 1)
        if command is None:
            return self._print_help()
        cmd.Cmd.do_help(self, line)