The position of PEP 622/634/535/636 authors is clear: we see this as a necessary feature to support using enums (e.g. Color.RED) or constants defined in other modules (e.g. re.I) when simple switch functionality is being migrated from literals (e.g. case 404) to named constants (e.g. case HTTPStatus.NOT_FOUND). Bothering users with the technicality of needing to use '==' here is a big usability hit.
On Thu, Nov 12, 2020 at 7:38 AM Baptiste Carvello < devel2...@baptiste-carvello.net> wrote: > Hi, > > Le 08/11/2020 à 07:47, Nick Coghlan a écrit : > > Hi folks, > > > > I have updated PEP 642 significantly based on the feedback received > > over the past week. > > > > [...] > a change that I feel is insufficiently discussed is the choice to have > "attr_constraint" as an inferred constraint. I can think of arguments to > defer it for now at least: > > * it is a one way door (if dotted names are made a constraint pattern > now, they can't become a capture pattern later); > > * it makes a difference from assignment target syntax, where you can > assign to a dotted name; > > * the shorthand notation is less valuable than for literals, as dotted > names are verbose already, 3 more characters make little difference; > > * the user has no explicit syntax to override the inferred semantics. > > I feel like some discussion of this choice in the PEP would make sense. > > Cheers, > Baptiste > _______________________________________________ > 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/RQPUV7PABLBNYJ7FI7QYCS6TKJ4H2Q2A/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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