On Thu, 07 Oct 2010 01:36:33 +0100, BartC wrote:
> However, as I mentioned, one problem here is having to evaluate all the
> items in the list before selecting one:
>
> def fna():
> print "FNA CALLED"
> return "One"
> def fnb():
> print "FNB CALLED"
> return "Two"
> def fnc():
> print "FNC CALLED"
> return "Three"
>
> i=16
> x = {1 : fna(), 2 : fnb(), 3 : fnc()}.get(i, "None Of The Above")
> print x
>
> Other than efficiency concerns, sometimes you don't want the extra
> side-effects.
Try this instead:
i=16
x = {1 : fna, 2 : fnb, 3 : fnc}.get(i, "None Of The Above")()
print x
Also known as the command dispatch pattern.
First class functions are a wonderful thing-ly y'rs,
--
Steven
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