> Ah I see. I will implement a (naive) __reversed__() method for the 
> partitions (see http://docs.python.org/2/library/functions.html#reversed) 
> since we've removed __len__() from the partition parents. That way you can 
> just call `reversed(Partitions(5))` to iterate through in reverse. Expect 
> it on the next #13605 push.
>

Done and pushed.
 

> I have never seen an application of the "right to left" lexicographic 
>> ordering, although I have this vague feeling that it appears in Stanley's 
>> book (but then, so do most things!:).
>>
>
> I've seen it, although it was in the context of simplicial complexes.
>

I've added it in case someone has an application for it. I will add more 
warnings about our convention between lex and rev lex orderings.

Best,
Travis

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