[Python-Dev] Tricky way of of creating a generator via a comprehension expression (original) (raw)
Yury Selivanov yselivanov.ml at gmail.com
Fri Nov 24 20:53:05 EST 2017
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On Fri, Nov 24, 2017 at 7:22 PM, Guido van Rossum <guido at python.org> wrote:
The more I hear about this topic, the more I think that
await,yieldandyield fromshould all be banned from occurring in all comprehensions and generator expressions. That's not much different from disallowingreturnorbreak.
IMO disallowing using await in comprehensions would be a huge mistake. I've personally seen a lot of code that uses the syntax.
Moreover, I haven't seen any complaints about await expressions in comprehensions in this thread or anywhere else. In this thread I only see complaints about 'yield' expression, and that's easy to understand -- yield in comprehensions is just unusable. 'await' is fundamentally different, because it's essentially a calling convention.
While "provisional" status for a PEP ultimately gives us power to remove every trace of it in the next release, I think that it decisions like that have to be based on some commonly reported problems and complaints. My 2c.
Yury
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