def arg(*args, **kwargs):
    """Decorator for CLI args."""

    def _decorator(func):
        if not hasattr(func, 'arguments'):
            func.arguments = []

        if func.arguments not in (args, kwargs):
            func.arguments.insert(0, (args, kwargs))

        return func

    return _decorator
dataset/ETHPy150Open openstack/python-senlinclient/senlinclient/common/utils.py/arg/swapped operands of `not in`