On Tue, 23 Jun 2020 at 17:07, Guido van Rossum <gu...@python.org> wrote: > > I'm happy to present a new PEP for the python-dev community to review. This > is joint work with Brandt Bucher, Tobias Kohn, Ivan Levkivskyi and Talin. > > Many people have thought about extending Python with a form of pattern > matching similar to that found in Scala, Rust, F#, Haskell and other > languages with a functional flavor. The topic has come up regularly on > python-ideas (most recently yesterday :-). > > I'll mostly let the PEP speak for itself: > - Published: https://www.python.org/dev/peps/pep-0622/ (*) > - Source: https://github.com/python/peps/blob/master/pep-0622.rst > > (*) The published version will hopefully be available soon. > > I want to clarify that the design space for such a match statement is > enormous. For many key decisions the authors have clashed, in some cases we > have gone back and forth several times, and a few uncomfortable compromises > were struck. It is quite possible that some major design decisions will have > to be revisited before this PEP can be accepted. Nevertheless, we're happy > with the current proposal, and we have provided ample discussion in the PEP > under the headings of Rejected Ideas and Deferred Ideas. Please read those > before proposing changes! > > I'd like to end with the contents of the README of the repo where we've > worked on the draft, which is shorter and gives a gentler introduction than > the PEP itself:
I'm just going to say that I *really* like the look of this proposal. I suspect there's going to be a fairly extensive, and detailed, discussion over some of the edge cases, but they can be worked out. Overall, though, I love the general idea. I'll hold off on saying anything more until I've read the PEP properly. In particular, the "Deferred Ideas" section seems to cover a lot of my initial "what about X" questions. Paul _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/PZE2VU5KZOMZEBYON7L6ODQ7GQWAQFAK/ Code of Conduct: http://python.org/psf/codeofconduct/
