Inverting permutations in Python

Question

I\'m new to programming, and I\'m trying to write a Python function to find the inverse of a permutation on {1,2,3,...,n} using the following code:

def inv(s         


        

Answer 1

Correct me if I have this wrong, but I think the problem with my code comes when I change str to a list: str is a string, and list(str) is a list of string elements. However, since string elements can't be numerically compared to numbers, the code fails to produce a result (other than []).