[Python-Dev] Switch statement
Guido van Rossum
guido at python.org
Sun Jun 25 18:28:48 CEST 2006
On 6/24/06, Nick Coghlan <ncoghlan at gmail.com> wrote:
> [...] a syntactic nit that Eric Sumner pointed out. Since
> it involves iteration over x to populate the jump table rather than doing a
> containment test on x, using 'case in x' is misleading. It would be better
> written as 'case *x'.
> 'case 1:' ==> a switch value of 1 will jump to this case
> 'case 1, 2:' ==> a switch value of 1 or 2 will jump to this case
> 'case *x' ==> any switch value in x will jump to this case
> 'case *x, *y' ==> any switch value in x or y will jump to this case
I'm +0 on this idea, or something similar (maybe my original 'case in'
syntax with 'in' replaced by '*'.
I'm going to have to sleep on Nick's 'once' proposal (which deserves a
--Guido van Rossum (home page: http://www.python.org/~guido/)
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