list math for version 1.5.2 without Numeric

[J.Jacob]

Oh I forgot that functions can be assigned to variables in Python,
elimination lookup.  As a dutch saying has it I was "comparing apples
with pears".

version_6:
        add = operator.add
        mul = operator.mul
        for j in range_nh:
            wij = wi[j]
            sum = reduce(add, map(mul, ai, wij))
Takes 71 seconds

Hmmm, still not the fastest version...

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