On Fri, Nov 24, 2017, 19:32 Guido van Rossum, <guido@python.org> wrote:On Fri, Nov 24, 2017 at 4:22 PM, Guido van Rossum <guido@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______________________________________________________________________________________________
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