Tetrating in Python?

Question

Python

I did not find functions for number tetration in NumPy / SciPy, where to look?
The function I wrote crashes due to stack overflow even on small numbers, in all sorts of numpais they are written here, it should be better with this, probably ..

Answer 1

Small - how much? 2^^5 ~ 2*10^19729, 2^^6 ~ 10^(6*10^19728).
There is no need to look anywhere, in python there is excellent integer arithmetic, and the whole blow falls on a single action - the last exponentiation. And there can be nothing with the stack:

def tet(a, n):
    return a ** (tet(a, n - 1)) if n else 1