[Python-ideas] Fwd: Replacing Infinite while Loops with an Iterator: async edition

[Jelle Zijlstra]

2018-06-24 12:30 GMT-07:00 <jab at math.brown.edu>:

> On Jun 23, 2018, at 21:11, Nathaniel Smith <n... at pobox.com> wrote:
>
>> He's asking for an async version of the 'iter' builtin, presumably
>> something like:
>> async def aiter(async_callable, sentinel):
>>    while True:
>>        value = await async_callable()
>>        if value == sentinel:
>>            break
>>        yield value
>> -n
>
>
> Yes, exactly (thanks, Nathaniel). Wouldn't that be a useful built-in?
>
> (Greg, I too would be surprised if this were the first time this idea has
> been raised, but I looked before posting and couldn’t immediately
> find prior discussion.)
>
> There is an open issue for this: https://bugs.python.org/issue31861. It
proposes adding aiter() and anext() as builtins.


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