def root(arg, n, k=0):
    n = sympify(n)
    if k:
        return Pow(arg, S.One/n)*S.NegativeOne**(2*k/n)
    return Pow(arg, 1/n)
Returns numerical Portal CIK.
dataset/ETHPy150Open sympy/sympy/sympy/functions/elementary/miscellaneous.py/root--crossover with--dataset/ETHPy150Open exosite-labs/pyonep/pyonep/portals/endpoints.py/Endpoints.portal_cik