# How to convert a negative number to positive?

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How can I convert a negative number to positive in Python? (And keep a positive one.)

``````>>> n = -42
>>> -n       # if you know n is negative
42
>>> abs(n)   # for any n
42
``````

Don’t forget to check the docs.

simply multiplying by -1 works in both ways …

``````>>> -10 * -1
10
>>> 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
``````

The inbuilt function abs() would do the trick.

``````positivenum = abs(negativenum)
``````

If you are working with numpy you can use

``````import numpy as np
np.abs(-1.23)
>> 1.23
``````

It will provide absolute values.

``````In : x = -2
In : x
Out: -2

In : abs(x)
Out: 2
``````

Actually `abs` will return the `absolute value` of any number. Absolute value is always a non-negative number. The answers/resolutions are collected from stackoverflow, are licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0 .