The posted code files explain how to solve systems of nonlinear equations in Python by using the function fsolve(). The tutorial webpages accompanying the posted code files are given here: Solve ...
I tried both python 3.7 and 3.8 and both give the same errors. Also, I tried on Centos, Ubuntu, and Windows 10 Bash using Anaconda 2021.05 (python 3.8), 2020.07(python 3.8), and 2019.10 (python 3.7).