[EMAIL PROTECTED] wrote:
> I have a list of numbers and I want to build another list with every
> second element multiplied by -1.
[...]
> But is there any other better way to do this.
I think the best way is the one that uses slices, as somebody suggested
in this thread. This is another (worse) way, just for fun:
>>> from itertools import cycle
>>> input = [1, 2, 3, 4, 5, 6]
>>> wanted = [x * sign for x, sign in zip(input, cycle([1, -1]))]
>>> wanted
[1, -2, 3, -4, 5, -6]
Cheers,
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Roberto Bonvallet
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