code: def load_cli(subparsers):
      
      for command_name in available_commands():
          module = '{}.{}'.format(__package__, command_name)
          loader, description = _import_loader(module)
          parser = subparsers.add_parser(command_name,
                                         description=description)
          command = loader(parser)
          if command is None:
              raise RuntimeError('Failed to load "{}".'.format(command_name))
          parser.set_defaults(cmmd=command)
docs: Given a parser, load the CLI subcommands