[Python-3000] Thoughts on collections.Container and collections.Iterable

[Lisandro Dalcin]

itertools.count() maybe ? Well not really infinite, it stops with
OverflowError...

But then (don't try this at home)...

>>> 4 in itertools.cycle(range(3)) # ups!

I seems that implicitely supporting containment testing for any
iterable is not always good idea.

On 2/9/08, Neil Toronto <ntoronto at cs.byu.edu> wrote:
> Neil Toronto wrote:
> > Guido van Rossum wrote:
> >> I would need to think more about this. I'm tempted not to do this, and
> >> let these ABCs denote the *explicit* presence of __contains__ and
> >> __iter__, respectively. Something that's iterable but doesn't
> >> implement __contains__ supports the 'in' operator very inefficiently
> >> (through linear search) which we might not want to encourage.
> > It could be worse. Is a container necessarily finite?
>
> I meant an iterable, of course, not a container.
>
> Neil
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-- 
Lisandro Dalcín
---------------
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