Best way to make a weighted sum

[Lulu of the Lotus-Eaters]

Jorge Godoy <godoy at metalab.unc.edu> wrote previously:
|    def CalculaSoma(self):
|        ie = self.ie
|        iter = len(ie)
|        for i in ie:
|            produto = i * self.pesos[iter]
|            self.soma = self.soma + produto
|            iter = iter - 1
|I don't know if I got it in the most pythonic way in my code.

Looks fine.  You could be somewhat more concise with:

    from operator import mul, add
    amts, weights = pesos.keys(), pesos.items()
    sum = reduce(add, map(mul, amts, weights))/reduce(add, weights)

I'll leave it to a native speaker to translate my var names to
Portuguese.

Yours, Lulu...

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