[Python-ideas] Add OrderedSet now that OrderedDict is in collections

[MRAB]

Steven D'Aprano wrote:
> On Sat, 9 May 2009 11:53:42 pm MRAB wrote:
> 
>> There's also the question of whether the order is significant. Does a
>> == b if a and b contain exactly the same items, but in a different
>> order? If they are lists, then yes; if they are multisets, then no.
> 
> I'm afraid you have made a mistake. List equality does not ignore order.
> 
>>>> [1, 2, 3] == [2, 1, 3]
> False
> 
Oops! Wrong way round.

I meant: If they are multisets, then yes; if they are lists, then no.