Travis Oliphant wrote:
> PEP: ###
> Title: Allowing any object to be used for slicing
> [...]
> Rationale
>
> Currently integers and long integers play a special role in slice
> notation in that they are the only objects allowed in slice
> syntax. In other words, if X is an object implementing the sequence
> protocol, then X[obj1:obj2] is only valid if obj1 and obj2 are both
> integers or long integers. There is no way for obj1 and obj2 to
> tell Python that they could be reasonably used as indexes into a
> sequence. This is an unnecessary limitation.
> [...]
I like the general idea from an academic point of view.
Just one question: could you explain what I should expect from x[
slicer('spam') : slicer('eggs') ] when slicer implements this
protocol?
Specifically, I'd like to known how you want to define the interval
between two objects. Or is that for the sliced/indexed object to
decide?
--eric
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