How To Get "first-order Optimality" With Python Script

I curious about how to get 'first-order optimality' value using python script. For optimatization python has many module like scipy.optimize and openopt. But I confused how to use

Solution 1:

Try scipy.linalg.basic.lstsq or scipy.optimize.minpack.curve_fit

Try to write your own code, refer to the tutorials or else search the web for scipy.linalg.basic.lstsq for code samples (there are some out there). If you encounter any issues, post the code and the issue here.