code: def format_help(self):
          
          if self._subparsers:
              for action in self._subparsers._actions:
                  if isinstance(action, LazySubParsersAction):
                      for parser_name, parser in action._name_parser_map.iteritems():
                          action._setup_subparser(parser_name, parser)
          return super(LazyArgumentParser, self).format_help()
docs: Sets up all sub-parsers when help is requested.