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

[Arnaud Delobelle]

On 9 May 2009, at 11:17, spir wrote:

> I feel the same. Unorder (like in dict or set) is not a feature, I  
> guess. Set is useful for it ensures uniqueness of items, not because  
> of unorder.

That is one reason why sets are useful.  Another reason, which is at  
least as important, is that {1,2}=={2,1} is true - and that's  
precisely because the elements are not ordered.  So absence of order  
is definitely a useful feature.

-- 
Arnaud