[Python-Dev] PEP for adding an sq_index slot so that any object, a or b, can be used in X[a:b] notation

Fri Feb 10 14:08:39 CET 2006

On 10 Feb 2006, at 12:45, Nick Coghlan wrote:
> An alternative would be to call it "__discrete__", as that is the key
> characteristic of an indexing type - it consists of a sequence of 
> discrete
> values that can be isomorphically mapped to the integers.

Another alternative: __as_ordinal__. Wikipedia describes ordinals as 
"numbers used to denote the position in an ordered sequence" which 
seems a pretty precise description of the intended result. The "as_" 
prefix also captures the idea that this should be a lossless conversion.
Mark Russell
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