def METHOD_NAME(*attr):
    def decorator(func):
        @wraps(func)
        def wrapper(self, *args, **kwargs):
            x = [getattr(self, a) for a in attr]
            if all(i is None for i in x):
                return func(self, *args, **kwargs)
            return x if len(x) > 1 else x[0]
        return wrapper
    return decorator