Inverse Cosine in Python

Apologies if this is straight forward, but I have not found any help in the python manual or google.

I am trying to find the inverse cosine for a value using python.

i.e. cos⁻¹(x)

Does anyone know how to do this?

Thanks

We have the acos function, which returns the angle in radians.

>>> import math
>>> math.acos(0)
1.5707963267948966
>>> _ * 2 - math.pi
0.0

To augment the correct answers to use math.acos, it is also worth knowing that there are math functions suitable for complex numbers in cmath:

>>> import cmath
>>> cmath.acos(1j)
(1.5707963267948966-0.88137358701954294j)

Stick with math.acos if you're only interested in real numbers,