I've seen quadruple negatives in Python: if not no_unavailable_items: ... else: ... unless on it's own is fine, but humans will misuse it

I've seen quadruple negatives in Python: if not no_unavailable_items: ... else: ... unless on it's own is fine, but humans will misuse it if you're not careful. You can address it with code reviews/standards/linters and get the best of both worlds.