[Python-3000] String formating operations in python 3k

[Barry Warsaw]

On Mon, 2006-04-03 at 15:23 -0500, Ian Bicking wrote:

> This is all wandering off-topic, except that all these cases make me 
> think that different kinds of wrapping are very useful.  For instance, 
> if you want to make sure everything is quoted before being inserted:
> 
> class EscapingWrapper:
>      def __init__(self, d):
>          self.d = d
>      def __getitem__(self, item):
>          return cgi.escape(str(self.d[item]), 1)
> 
> Or if you want expressions:
> 
> class EvalingWrapper:
>      def __init__(self, d):
>          self.d = d
>      def __getitem__(self, item):
>          return eval(item, d)
> 
> Then you do:
> 
> string.Template(pattern).substitute(EscapingWrapper(EvalingWrapper(locals()))

I like this.  I'd probably not utilize EvalingWrapper, just because I'd
really want to keep translatable strings really really simple.  I think
most translators can grok simple $-substitutions because they've seen
those in many other languages.

-Barry

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