Modifying every alternate element of a sequence
jm.suresh at gmail.com
Tue Nov 28 11:38:09 CET 2006
I have a list of numbers and I want to build another list with every
second element multiplied by -1.
input = [1,2,3,4,5,6]
wanted = [1,-2,3,-4,5,-6]
I can implement it like this:
input = range(3,12)
wanted = 
for (i,v) in enumerate(input):
if i%2 == 0:
But is there any other better way to do this.
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