Ordering python sets

[Marc 'BlackJack' Rintsch]

On Sat, 25 Oct 2008 21:53:10 +0000, Lie Ryan wrote:

> Oh no, the two dict implementation would work _exactly_ the same from
> the outside, they are transparently interchangeable. Only the
> performance characteristic differs because of the different
> implementation.

They are not 100% interchangeably.  Dictionaries as implemented need keys 
to be hashable objects and sorted dictionaries need the keys to have an 
order defined.  So switching mapping types may fail unless the key 
objects already have the needed magic methods implemented to do the right 
thing.

Ciao,
	Marc 'BlackJack' Rintsch