python - 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.

My input is

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

How can I make it into this format as I am trying calculate the area

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

Answer 1

Try a list comprehension:

x2 = [abs(k) for k in x]