Yet Another Switch-Case Syntax Proposal

[Ian Kelly]

On Apr 4, 2014 3:51 AM, "Marko Rauhamaa" <marko at 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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