How to convert a negative number to positive?
>>> n = -42>>> -n # if you know n is negative42>>> abs(n) # for any n42Don't forget to check the docs.
simply multiplying by -1 works in both ways ...
>>> -10 * -110>>> 10 * -1-10
If "keep a positive one" means you want a positive number to stay positive, but also convert a negative number to positive, use abs():
>>> abs(-1)1>>> abs(1)1