List comprehension timing difference.

Bart Kastermans bkasterm at gmail.com
Sat Sep 3 04:15:11 CEST 2011


ting at thsu.org writes:

> On Sep 2, 9:54 am, Bart Kastermans <bkast... at gmail.com> wrote:
>> if d(a,b) == 1 and a < b:
>
> It will probably be faster if you reverse the evaluation order of that
> expression.
>
> if a<b and d(a,b)==1:
>
> That way the d() function is called less than half the time. Of course
> this assumes that a<b is a faster evaluation than d(a,b), but I think
> that's true for your example.
> --
> // T.Hsu

Indeed makes quite a difference, goes from 275 seconds down to
153 seconds.



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