conditional computation

Gabriel Genellina gagsl-py at yahoo.com.ar
Thu Oct 26 22:01:52 CEST 2006


At Thursday 26/10/2006 16:30, robert wrote:

>I want to use a computation cache scheme like
>
>
>         o = CACHECOMPUTE  complex-key-expr  expensive-calc-expr
>
>
>frequently and elegantly without writing complex-key-expr or 
>expensive-calc-expr twice.
>So its ugly:
>
>         _=complex-key-expr; o=cache.get(_) or 
> cache.setdefault(_,expensive-calc-expr)
>
>Any ideas?

The memoize pattern can help; in 
http://wiki.python.org/moin/PythonDecoratorLibrary you can see an 
implementation using decorators.


-- 
Gabriel Genellina
Softlab SRL 

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