On Wed, Aug 8, 2018 at 12:28 PM Paul Moore <p.f.mo...@gmail.com> wrote: > > On Wed, 8 Aug 2018 at 16:58, Oscar Benjamin <oscar.j.benja...@gmail.com> > wrote: > > Thinking about this some more: closing() can ensure finalisation but > > it is still generally bad to yield from a with block. Some context > > managers are designed to temporarily alter global state between > > __enter__ and __exit__ - this can be very confusing if you use them > > around a yield block. > > Surely that's *precisely* what PEP 567 (Context Variables) was > designed to address?
To be even more precise, PEP 550 was designed to solve state handling problem for both "await" (coroutines) and "yield" (generators). It was rejected in favour of a more simplistic PEP 567 that solves it only for coroutines. PEP 568 was later drafted by Nathaniel. It applies PEP 550's ideas to 567 API/design to allow generators to have execution context too in Python 3.8 or 3.9. The fate of PEP 568 is still undecided. Yury _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
