[Python-Dev] Tricky way of of creating a generator via a comprehension expression

[Guido van Rossum]

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`.

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