[Python-ideas] sentinel_exception argument to `iter`

[Yury Selivanov]

And, FWIW, take a look at itertools.takewhile.
Your particular example would look like

     itertools.takewhile(lambda el:my_deque, my_deque)

On 2/6/2014, 7:17 PM, Ram Rachum wrote:
> Looks like someone needs to read the `iter` docs :)
>
>
> On Fri, Feb 7, 2014 at 2:14 AM, Yury Selivanov <yselivanov.ml at gmail.com>wrote:
>
>> On 2/6/2014, 7:10 PM, Ram Rachum wrote:
>>
>>> Hi,
>>>
>>> This time I'm posting on the right list :) Sorry for the mistake in the
>>> last thread.
>>>
>>> `iter` has a very cool `sentinel` argument. I suggest an additional
>>> argument `sentinel_exception`; when it's supplied, instead of waiting for
>>> a
>>> sentinel value, we wait for a sentinel exception to be raised, and then
>>> the
>>> iteration is finished.
>>>
>>> This'll be useful to construct things like this:
>>>
>>>       my_iterator = iter(my_deque.popleft, IndexError)
>>>
>>>   Before starting discussion about the new parameter:
>> how passing 'my_deque.popleft' is supposed to work?
>>
>> Yury
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