# How to convert positive numbers to negative in Python?

## How to convert positive numbers to negative in Python?

If you want to force a number to negative, regardless of whether its initially positive or negative, you can use:

``````    -abs(n)
``````

Note that `0` will remain `0`.

`-abs(n)` is a really good answer by Tom Karzes earlier because it works whether you know the number is negative or not.

If you know the number is a positive one though you can avoid the overhead of a function call by just taking the negative of the variable:

``````-n
``````

This may not matter much at all, but if this code is in a hot loop like a gameloop then the overhead of the function call will add add up.

``````>>> timeit.timeit(x = -abs(y), setup=y = 42, number=5000)
0.0005687898956239223
>>> timeit.timeit(x = -y, setup=y = 42, number=5000)
0.0002599889412522316
``````

#### How to convert positive numbers to negative in Python?

I believe the best way would be to multiply each number by -1:

``````def negativeNumber(x):
neg = x * (-1)
return neg
``````