On Sun, Oct 21, 2018 at 8:45 PM MRAB <pyt...@mrabarnett.plus.com> wrote: > FTR, this has been discussed before: > > [Python-ideas] `__iter__` for queues? > https://mail.python.org/pipermail/python-ideas/2010-January/006711.html
Thank you! For the sake of clarity, I want to outline a few differences between that discussion and my proposal: 1. Much of the discussion there seemed to implicitly limit itself to consideration of FIFO queues. This proposal works cleanly for child classes too, including any (API-compliant) user-written children. 2. Throughout that discussion, iteration is the A feature, and closing is occasionally mentioned as a possible prerequisite. In this proposal, the A feature is closing, which enables sensible iteration (as a B feature) but is useful even if iteration isn't used. 3. There's naturally a lot of quick spitballing of various mutually-incompatible ideas there, whereas this is one rounded self-consistent proposal. Most of what I've come up with has already been anticipated there but it's all mixed up textually. 4. This proposal sidesteps a lot of the doubts and difficulties by just not using sentinels at all. Being closed is part of the queue's state that can be queried at any time, and will affect put() calls immediately, without waiting for a sentinel to float up to the front. (With recognition that your (MRAB's) message towards that thread's end already proposed the same approach.) _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
