Jeffrey Yasskin wrote:
> For Python, I think I favor reviving __cmp__ for totally ordered
> types, and asking that partially ordered ones return NotImplemented
> from it explicitly.
Returning NotImplemented already means "I don't recognise the other
type". A fully implemented partial ordering is not the same thing.
None could possibly be coopted for the job of representing
unequal-but-not-ordered, but has the major downside of evaluating to
False as a truth value.
A new task-specific singleton as a Greg suggested is a definite
possibility though.
Cheers,
Nick.
--
Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
---------------------------------------------------------------
http://www.boredomandlaziness.org
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