On Sun, Oct 1, 2017 at 1:52 PM, Koos Zevenhoven <k7ho...@gmail.com> wrote:
> On Oct 1, 2017 19:26, "Guido van Rossum" <gu...@python.org> wrote: > > Your PEP is currently incomplete. If you don't finish it, it is not even a > contender. But TBH it's not my favorite anyway, so you could also just > withdraw it. > > > I can withdraw it if you ask me to, but I don't want to withdraw it > without any reason. I haven't changed my mind about the big picture. OTOH, > PEP 521 is elegant and could be used to implement PEP 555, but 521 is > almost certainly less performant and has some problems regarding context > manager wrappers that use composition instead of inheritance. > It is my understanding that PEP 521 (which proposes to add optional __suspend__ and __resume__ methods to the context manager protocol, to be called whenever a frame is suspended or resumed inside a `with` block) is no longer a contender because it would be way too slow. I haven't read it recently or thought about it, so I don't know what the second issue you mention is about (though it's presumably about the `yield` in a context manager implemented using a generator decorated with `@contextlib.contextmanager`). So it's really between PEP 550 and PEP 555. And there are currently too many parts of PEP 555 that are left to the imagination of the reader. So, again, I ask you to put up or shut up. It's your choice. If you don't want to do the work completing the PEP you might as well withdraw (once I am satisfied with Yury's PEP I will just accept it when there's no contender). If you do complete it I will probably still choose PEP 550 -- but at the moment the choice would be between something I understand completely and something that's too poorly specified to be able to reason about it. --Guido > -- Koos > > > > On Oct 1, 2017 9:13 AM, "Koos Zevenhoven" <k7ho...@gmail.com> wrote: > >> On Sep 29, 2017 18:21, "Guido van Rossum" <gu...@python.org> wrote: >> >> >> PS. PEP 550 is still unaccepted, awaiting a new revision from Yury and >> Elvis. >> >> >> This is getting really off-topic, but I do have updates to add to PEP 555 >> if there is interest in that. IMO, 555 is better and most likely faster >> than 550, but on the other hand, the issues with PEP 550 are most likely >> not going to be a problem for me personally. >> >> -- Koos >> > > -- --Guido van Rossum (python.org/~guido)
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