[Python-Dev] Tricky way of of creating a generator via a comprehension expression (original) (raw)

Ivan Levkivskyi levkivskyi at gmail.com
Wed Nov 22 14:37:37 EST 2017


On 22 November 2017 at 20:33, Guido van Rossum <guido at python.org> wrote:

On Wed, Nov 22, 2017 at 11:12 AM, Ivan Levkivskyi <levkivskyi at gmail.com> wrote:

On 22 November 2017 at 20:05, Guido van Rossum <guido at python.org> wrote:

On Wed, Nov 22, 2017 at 10:54 AM, Jelle Zijlstra <_ _jelle.zijlstra at gmail.com> wrote

2017-11-22 9:58 GMT-08:00 Guido van Rossum <guido at python.org>: (OTOH, await in the same position must keep working since it's not broken and not unintuitive either.)

This is very questionable IMO. So do you think that [await x for y in z] and list(await x for y in z) being not equivalent is intuitive? I see, that's why this is such a long thread. :-( But are they different? I can't find an example where they don't give the same outcome. I think this is a minimal example https://bugs.python.org/issue32113 Also Yury explains there why [await x for y in z ] is different from list(await x for y in z). Although I understand why it works this way, TBH it is not very intuitive.

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