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[Python-Dev] Tricky way of of creating a generator via a comprehension expression

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On 23 November 2017 at 12:42, Ivan Levkivskyi <levkivskyi at gmail.com> wrote:
>> See e.g. http://www.tornadoweb.org/en/stable/gen.html
>>
>
> Great, so I open this page and see this code:
>
> results = []
> for future in list_of_futures:
>     results.append(yield future)
>
> Interesting, why don't they use a comprehension for this and instead need to
> invent a whole `tornado.gen.multi` function?

Because yield expressions in comprehensions are difficult to
understand, and the loop form is easy to understand? :-) (Certainly I
didn't find the explanation in that page confusing, I don't know if
I'd have found a comprehension form confusing, but I suspect I might
have...)

Paul

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