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

[Mark Russell]

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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