I almost posted this as a comment to the other answers but it’s really an answer in and of itself.
To make your items sortable, they only need to implement __lt__. That’s the only method used by the built in sort.
The other comparisons or functools.total_ordering are only needed if you actually want to use the comparison operators with your class.
To make your items hashable, you implement __hash__ as others noted. You should also implement __eq__ in a compatible way — items that are equivalent should hash the same.