[Python-ideas] sentinel_exception argument to `iter`

[Ram Rachum]

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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