How to fix the error - "ZeroDivisionError: Inverse of Mod(0,2) does noet exist"?

Question

Python

Hello.

Code description:



I made the code, it gives an error in line 65. link to the code - https://pastebin.com/WQJ4gbcL

code piece where the error is:

elif (m % 2 == 0):
return successiveSquare(m/2, double(P , E), E)

Error text - ZeroDivisionError: Inverse of Mod(0,2) does noet exist.

As I understand it, you need to fix the type of variables or something else that would work normally, but I can’t figure out how to do this.

Thank you all very much for your help!!