[Tutor] Question related to for loops

[Alan Gauld]

On 19/03/2021 19:33, Mark Lawrence wrote:

>>>      odd = sum(i for i in x if i%2 != 0)
>>>      even = sum(i for i in x if i%2 == 0)

> I don't see any resultant lists to loop over, only a generator 
> expression being passed to sum.

Good point, I was thinking the generator built a list then
summed it but with a generator it adds as it goes.

But it is still looping over the original list twice so
I'd still expect it to be slower. (Although 2 generators
in C might beat a single python loop) As always with
performance questions you'd need to measure it on real
world data.

-- 
Alan G
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