[Shootout-list] better python implementation for the statistics bench

[Antoine]

Hi, 

The following Python implementation is a bit better for the statistics
bench. It exhibits a 30% speedup if used with Psyco (compared to the
original one *with* Psyco), a more modest 5% if Pysco is not used.

It uses some little tricks :
- the "reduce" function is slower in many cases than a simple loop
(especially with Psyco)
- the "abs" function is replaced by a local variable pointing to it
(local variables are optimized by the Python interpreter)
- some calculations are avoided inside the loop : this could be used for
other languages as well.

I hope that helps ;)

Regards

Antoine.

PS : i'm not subscribed to the list (i'm already receiving too many
mailing-lists ;()

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