I think putting the context manager ABC in contextlib is the right thing. However I detest functools and I really don't think Callable belongs there. It's been in collections.abc since it was introduced AFAIK, and it should just be grandfathered in. If I had to pick a better place for it I'd vote for (plain) abc, since that stores fundamental types. IMO Callable is a lot more fundamental than a context manager (even though both have direct interpreter support).
On Thu, Dec 3, 2015 at 5:27 PM, Brett Cannon <br...@python.org> wrote: > In http://bugs.python.org/issue25609 I said I wanted an ABC for context > managers and a matching entry in typing. I originally suggested putting it > in collections.abc > <https://docs.python.org/3/library/collections.abc.html> but Raymond > Hettinger pointed out that it doesn't really belong there (along with a > bunch of other ABCs like Callable and Awaitable). > > So I opened http://bugs.python.org/issue25637 to discuss this, but I > realize maybe this SIG is a better place to have a real discussion. The > options I see are: > > 1. Ignore Raymond's objection and put it in collections.abc > 2. Stick it in contextlib > <https://docs.python.org/3/library/contextlib.html> > 1. Directly > 2. In a new contextlib.abc submodule > 3. Stick in abc <https://docs.python.org/3/library/abc.html> > 1. Directly > 2. In some new subclass like abc.interfaces > > Do people have any thoughts on this? Whatever decision we make in this > instance should probably apply to the other misplaced ABCs in > collections.abc (e.g., should Callable go into functools somehow, into > abc?). > > Yury Selivanov voted for putting them in abc directly since having to > always try and find a proper module to put the abc might not always work, > and so putting the concrete interface ABCs that directly define what > Python's syntactic sugar and interpreter rely on made sense. Terry Reedy > even suggested that collections.abc was a mistake and should have been made > abc.collections (which wouldn't be hard due to how all the relevant code > for collections.abc is in Lib/_collection_abc.py and hence already in an > odd place). > > I'm a little partial to putting the ABCs in relevant modules like > functools and contextlib, but otherwise I think abc makes sense. > > _______________________________________________ > stdlib-sig mailing list > stdlib-sig@python.org > https://mail.python.org/mailman/listinfo/stdlib-sig > > -- --Guido van Rossum (python.org/~guido)
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