tymofij

import math

def cube_root(x):
    # negative number cannot be raised to a fractional power
    res = math.copysign(abs(x) ** (1.0/3), x)
    # 64 ** (1/3.0) gives us 3.9999999999999996
    # and it breaks things up pretty bad. let's try finding int one
    rounded_res = int(round(res))
    if rounded_res ** 3 == x:
        res = rounded_res