[Python-Dev] Termination of two-arg iter()

[Tim Peters]

[jepler@unpythonic.net]
> What about this example?
> >>> l = []
> >>> li = iter(l)
> >>> li.next()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> StopIteration
> >>> l.extend([1, 2, 3])
> >>> li.next()
> 1
>
> does the list iterator violate the proposed behavior?

Oh yes.  OTOH, its current behavior isn't defined well enough anywhere
(short of reading the source code) that raising StopIteration on the second
call today could be called "a bug" either.