[Tutor] Question related to for loops

[Alan Gauld]

On 19/03/2021 15:55, Manprit Singh wrote:

> In an other way if i write the same function like this :
> def odd_evensum(x):
>     odd = sum(i for i in x if i%2 != 0)
>     even = sum(i for i in x if i%2 == 0)
>     return odd, even
> 
> what should be preferred?

In this case you loop over the input list twice
 - once for odds and once for evens.
Then you loop over each of the resultant lists
again to do the summations.

I haven't measured it but would expect the second
version to be significantly slower for large input
lists.

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Alan G
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