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Re: Yet Another Switch-Case Syntax Proposal

References <8084-1396540962-768613@sneakemail.com> <mailman.8852.1396550862.18130.python-list@python.org> <533e6e58$0$29993$c3e8da3$5496439d@news.astraweb.com> <87ioqpqvef.fsf@elektro.pacujo.net>
Date 2014-04-04 10:02 -0600
Subject Re: Yet Another Switch-Case Syntax Proposal
From Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.8894.1396627349.18130.python-list@python.org> (permalink)

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On Apr 4, 2014 3:51 AM, "Marko Rauhamaa" <marko@pacujo.net> wrote:
>
> >>> switch day casein ("Monday", "Thursday", "Wednesday", "Tuesday",
> >>> "Friday"):
> >>>      gotowork = True
> >>>      continue
> >>> casein ("Monday", "Thursday", "Wednesday", "Tuesday", "Friday"):
> >>>      daytype = "ferial"
> >>> casein ("Saturday", "Sunday")
> >>>      daytype = "festive"
>
> That "casein" next to "switch" bugs me. Did I already propose:
>
>    switch: local_sabbath()
>    case (1, 2, 3) as sabbath:
>        ...
>    case 6:
>        ...
>    else:
>        ...

I don't get what this is intended to do. First, why is the expression in
the first line after the colon? That doesn't match any existing block
syntax (as you note it matches lambda, but that's an expression-level
syntax). What's wrong with the much more natural "switch local_sabbath():"?

Second, "as" clauses are used in other contexts for local assignment. What
is the purpose of doing that here? How does this solve the problem of
explicitly denoting case multiplicity?

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Re: Yet Another Switch-Case Syntax Proposal Ethan Furman <ethan@stoneleaf.us> - 2014-04-03 11:23 -0700
  Re: Yet Another Switch-Case Syntax Proposal Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-04-04 08:33 +0000
    Re: Yet Another Switch-Case Syntax Proposal Marko Rauhamaa <marko@pacujo.net> - 2014-04-04 12:46 +0300
      Re: Yet Another Switch-Case Syntax Proposal Ian Kelly <ian.g.kelly@gmail.com> - 2014-04-04 10:02 -0600
        Re: Yet Another Switch-Case Syntax Proposal Marko Rauhamaa <marko@pacujo.net> - 2014-04-04 19:44 +0300
          Re: Yet Another Switch-Case Syntax Proposal Ian Kelly <ian.g.kelly@gmail.com> - 2014-04-04 11:55 -0600

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