"Stefan Behnel" <stefan...@behnel.de> wrote
Why use math.sqrt() instead of just using the ** operator?
return sum(x for x in range(1, int(n**0.5)) if n%x == 0)
Since this operation is only evaluated once in the whole runtime of
the loop, I think readability beats the likely very tiny performance
difference here.
Ah, I wondered if readability was the reason. I hadn't thought about
it hard enough to notice the sqrt() would only be called once! :-)
As to readability I personally prefer the exponentiation sign (or even
pow()!)
and don't think I have ever used math.sqrt() in my 12 years of Python.
But I recognise that some may prefer sqrt, especially if they don't
have a math background.
Alan G.
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