So we are keeping asynchronous generator expressions as long as they are
defined in an 'async def' coroutine?
Yury
On Sat, Nov 25, 2017 at 12:17 PM Brett Cannon
On Fri, Nov 24, 2017, 19:32 Guido van Rossum,
wrote: On Fri, Nov 24, 2017 at 4:22 PM, Guido van Rossum
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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