Indexing in lists

[David Wishart]

I've come across something strange if I try and sum a list. In short the indexing appears inconsistent, best explained by the example I've made.

https://numbas.mathcentre.ac.uk/question/share/view/7028cf8f-105c-4d31-bcae-80404c3ea551

Is taking subsections of lists to be avoided?

[Martin Jones]

Hi David

The issue seems not to be with the sum function, but with indexing the list like that.

In your example you will find that array[0..2] = [5, 10] which perhaps unexpected.

Martin

[Christian Lawson-Perfect]

I think you're just used to a different convention. Numbas uses the same convention for slices as python: [a..b] takes the elements from index a, up to but not including index b.

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[David Wishart]

Thanks, that makes sense. Python isn't really something I've done a lot of.