[Python-Dev] PEP 246: lossless and stateless

[Simon Percivall]

On 2005-01-15, at 18.06, Phillip J. Eby wrote:
> At 05:32 PM 1/15/05 +0100, Just van Rossum wrote:
>> Phillip J. Eby wrote:
>>
>> > >It's not at all clear to me that "sticky" behavior is the best
>> > >default behavior, even with implicit adoptation. Would anyone in
>> > >their right mind expect the following to return [0, 1, 2, 3, 4, 5]
>> > >instead of [0, 1, 2, 0, 1, 2]?
>> > >
>> > >   >>> from itertools import *
>> > >   >>> seq = range(10)
>> > >   >>> list(chain(islice(seq, 3), islice(seq, 3)))
>> > >   [0, 1, 2, 0, 1, 2]
>> > >   >>>
>> >
>> > I don't understand why you think it would.  What does islice have to
>> > do with adaptation?
>>
>> islice() takes an iterator, yet I give it a sequence.
>
> No, it takes an *iterable*, both practically and according to its 
> documentation:

But it _does_ perform an implicit adaptation, via PyObject_GetIter. A 
list has no next()-method, but iter(list()) does.

//Simon