> Can we discuss whether we want pattern matching in Python and the broader > semantics first, before dealing with low level details?
This is a huge step backward. These discussions have already taken place, over the last 10 years. Here's just a sampling: - https://mail.python.org/archives/list/python-id...@python.org/thread/IEJFUSFC5GBDKFIPCAGS7JYXV5WGVAXP/ - https://mail.python.org/archives/list/python-id...@python.org/thread/GTRRJHUG4W2LXGDH4AU46SI3DLWXJF6A/ - https://mail.python.org/archives/list/python-id...@python.org/thread/EURSG3MYEFHXDDL2474PQNQZFJ3CUIOX/ - https://mail.python.org/archives/list/python-id...@python.org/thread/NTQEL3HRUJMULQYI6RDBTXQ2H3KHBBRO/ - https://mail.python.org/archives/list/python-id...@python.org/thread/NEC54II2RB3JRGHDP6PX3NOEALRAK6BV/ - https://mail.python.org/archives/list/python-id...@python.org/thread/T3VBUFECTLZMB424MBBGUHCI24YA4FPT/ We read all of these and more back way in March, before we even started brainstorming syntax and semantics. > Do we want a fancy switch statement, or a powerful expression? It's right here that you lose me. Anyone who reduces pattern matching to "a fancy switch statement" probably isn't the right person to be discussing its semantics and usefulness with. It seems that some people just can't separate the two ideas in their mind. It's like calling a class a "fancy module". It's okay that you feel that way, but hopefully you'll understand if people start to tune out messages that contain these sorts of comments. > What special method(s) should be added? None. PEP 622 originally added one, but even that is more than we need right now. Some people may need to register their mappings or sequences as Mappings or Sequences, but otherwise that's it. > I would ask anyone who wants pattern matching adding to Python, to not > support PEP 634. Seriously? I would ask anyone who wants pattern matching added to Python to carefully consider the PEPs for themselves (particularly PEP 636, which is much less dry and contains more examples and commentary). We've written four of the largest, most detailed PEPs of any new feature I've seen, complete with a working implementation that we've made available from any browser. Of course it's not the *only* way of getting pattern matching... but if you want it, this is probably your *best* shot at getting it. Brandt _______________________________________________ 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/DEUZMFMTDBYUD3OHB5HNN7MWWNP237VV/ Code of Conduct: http://python.org/psf/codeofconduct/
