[Python-Dev] Switch statement
Guido van Rossum
guido at python.org
Fri Jun 23 19:23:29 CEST 2006
On 6/23/06, Alex Martelli <aleaxit at gmail.com> wrote:
> On 6/22/06, Guido van Rossum <guido at python.org> wrote:
> > Independent from this, I wonder if we also need static names of the form
> > static <name> = <expression>
> > which would be similar to
> > <name> = static (<expression>)
> > but also prevents <name> from being assigned to elsewhere in the same scope.
> Lovely!!! Definitely +1. Could perhaps THIS use of static be allowed
> even outside of a def? I'd just love to have such static names in
> modules and classes, too (with runtime checks of errant assignments,
> if needed).
It would provide no speed advantage, and I don't see how the
staticness would be transferred upon import into another module.
Runtime checks of errant assignments would be relatively easy: trap
this in the module setattr operation, and henceforth let
module.__dict__ return a read-only dict wrapper. (Except that would
break "exec E in globals()". I guess it would have to be a dict
wrapper that only makes those specific keys read-only...)
--Guido van Rossum (home page: http://www.python.org/~guido/)
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