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[Jeff Shannon]

In article <kuk7qm8r3z.fsf at lasipalatsi.fi>, Erno Kuusela says...

> % python ding.py
> <function listcomp_test at 1482a4> 6.82
> <function map_test at 1482d4> 1.83
> python ding.py  17.44s user 0.16s system 98% cpu 17.897 total
> 
> the map version is also more readable, imho.

Hm, I'm slightly surprised that there's that significant of a 
difference in this case.  Just goes to further reinforce that 
performance needs to be measured, not guessed at.  :)

And I won't deny that in this case, the map version is quite 
readable.  Other cases are not necessarily so, and I generally 
prefer reading list comps, but this is largely a matter of taste.  
(Of course, if performance is a *true* issue, then it's necessary 
to try both and see which performs best in the particular 
circumstance, because the answer can vary either way.)

Not that I think that Erno doesn't already know this, I'm merely 
elucidating for others who might be following along.  :) 

-- 

Jeff Shannon
Technician/Programmer
Credit International