On Fri, Nov 24, 2017, 19:32 Guido van Rossum, <gu...@python.org> wrote:
> On Fri, Nov 24, 2017 at 4:22 PM, Guido van Rossum <gu...@python.org> > wrote: > >> The more I hear about this topic, the more I think that `await`, `yield` >> and `yield from` should all be banned from occurring in all comprehensions >> and generator expressions. That's not much different from disallowing >> `return` or `break`. >> > > From the responses it seems that I tried to simplify things too far. Let's > say that `await` in comprehensions is fine, as long as that comprehension > is contained in an `async def`. While we *could* save `yield [from]` in > comprehensions, I still see it as mostly a source of confusion, and the > fact that the presence of `yield [from]` *implicitly* makes the surrounding > `def` a generator makes things worse. It just requires too many mental > contortions to figure out what it does. > > I still propose to rule out all of the above from generator expressions, > because those can escape from the surrounding scope. > +1 from me. -Brett > -- > --Guido van Rossum (python.org/~guido) > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/brett%40python.org >
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