specifying constants for a function (WAS: generator expressions: performance anomaly?)

Nick Coghlan ncoghlan at iinet.net.au
Sat Jan 22 07:22:33 CET 2005


Steven Bethard wrote:
> I wrote:
>  > If you really want locals that don't contribute to arguments, I'd be
>  > much happier with something like a decorator, e.g.[1]:
>  >
>  > @with_consts(i=1, deftime=time.ctime())
>  > def foo(x, y=123, *args, **kw):
>  >    return x*y, kw.get('which_time')=='now' and time.ctime() or deftime
>  >
>  > Then you don't have to mix parameter declarations with locals
>  > definitions.
>  >
>  > Steve
>  >
>  > [1] I have no idea how implementable such a decorator would be.  I'd
>  > just like to see function constants declared separate from arguments
>  > since they mean such different things.
> 
> I played around with this, and I think it's basically implementable:

Raymond's constant binding decorator is probably a good model for how to do it:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/277940

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at email.com   |   Brisbane, Australia
---------------------------------------------------------------
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