Invert negative values in a list

Question

I am trying to convert a list that contains negative values, to a list of non-negative values; inverting the negative ones. I have tried abs but it didn\'t work

Answer 1

This is a wrong answer to your question, but this is what I came here looking for. This is how to invert all the numbers in your list using operator.neg; i.e. also positives to negatives.

import operator
x = [10,9,8,7,6,5,4,3,2,1,0,-1,-2,-3,-4,-5,-6,-7,-8,-9,-10]
x = list(map(operator.neg, x))

It returns:

[-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Or you can do a list comprehension of course:

x = [-xi for xi in x]