Running a gams file from python - gams system directory error

Question

I would like to run GAMS mdoel from python through the gams python API.

I insalled the API and it works fine:

import gams 
print(f'API OK -- Version {gams.__version__}')'''

I get:

API OK -- Version 45.1.0

However when I try to:

from gams import GamsWorkspace
ws = GamsWorkspace()

I get:

GamsException: GAMS System directory  not found or invalid.

I tried putting the gams installation path to no avail. The error mentions to use "findthisgams.exe" but I cannot find it.

(gams is intalled and I am able to run it from the GUI)

This is similar to this question: How to run GAMS from python?

still I am stuck.

Answer 1

Just in case this can be useful to someone, I solved like this. Thanks @Lutz for putting me on the right track.I did not use the API but it does what I wanted it to do.

import subprocess

def run_gams(filename, fileoutput):
    try:
        # run gams with the same arguments I would use from the command line
        subprocess.run([r"C:\PATHT\TO\gams.exe", filename, fileoutput], check=True)
    except subprocess.CalledProcessError as e:
        # Handle any errors that may occur during the GAMS execution
        print(f"Error running GAMS: {e}")
        # Print the error output
        print("Error Output:")
        print(e.stderr)
    

run_gams(r".\PATH\TO\dummy_model.gms", r"Output=.\PATH\TO\dummy_output.txt")