如何在 Python 中找到立方根？

Question

I've tried to find the cube root in Python but I have no idea how to find it. There was 1 line of code that worked but he wouldn't give me the full number. Example:

math.pow(64, 1/3)

This doesn't give me 4 tough but 3.99999. Does anyone know how I am supposed to fix this?

Answer 1

You can use the power operator ** with fractions like:

Python3:

>>> 8**(1/3)
2.0

Python2:

>>> 8**(1.0/3)
2.0

Answer 2

This is one option without using math library

>>> 64**(1/3)
3.9999999999999996
>>> round(64**(1/3.),2)
4.0

If you want to do with your code, you can apply 'round()' method

>>>import math
>>>round(math.pow(64,1/3.))
4

Answer 3

in Python 3.11 , math.cbrt

 x = 64
 math.cbrt(x)

(or)

use numpy

import numpy as np
x = 64
np.cbrt(x)