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. -- --Guido van Rossum (python.org/~guido)
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