def add_create_update_args(parser, required_args, optional_args, create=False):
    """Wrapper around ``add_parser_arguments``.

    If ``create`` is True, one argument group will be created for each of
    ``required_args`` and ``optional_args``. Each required argument will have
    the ``required`` parameter set to True automatically.

    If ``create`` is False, only one group of optional arguments will be
    created containing all the arguments.

    The arguments should be specified the same way as for
    ``add_parser_arguments``.
    """
    if create:
        for key in required_args:
            required_args[key]['required'] = True
        add_parser_arguments(parser, required_args, group='required arguments')
    else:
        optional_args.update(required_args)
    add_parser_arguments(parser, optional_args)