apis/examples_python/transport1_8py_source.html

import os

import sys

from gams import GamsWorkspace


if __name__ == "__main__":

    sys_dir = sys.argv[1] if len(sys.argv) > 1 else None

    work_dir = sys.argv[2] if len(sys.argv) > 2 else None

    ws = GamsWorkspace(system_directory=sys_dir, working_directory=work_dir)

    ws.gamslib("trnsport")


    print("Run with Default:")

    job = ws.add_job_from_file("trnsport.gms")

    job.run()

    for rec in job.out_db["x"]:

        print(

            f"x({rec.key(0)},{rec.key(1)}): level={rec.level} marginal={rec.marginal}"

        )


    print("Run with XPRESS:")

    opt = ws.add_options()

    opt.all_model_types = "xpress"

    job.run(opt)

    for rec in job.out_db["x"]:

        print(

            f"x({rec.key(0)},{rec.key(1)}): level={rec.level} marginal={rec.marginal}"

        )


    print("Run with XPRESS and non default option:")

    with open(os.path.join(ws.working_directory, "xpress.opt"), "w") as file:

        file.write("algorithm=barrier")

    opt.optfile = 1

    with open(os.path.join(ws.working_directory, "transport1_xpress.log"), "w") as log:

        job.run(opt, output=log)  # job.run(opt, output=sys.stdout)

    for rec in job.out_db["x"]:

        print(

            f"x({rec.key(0)},{rec.key(1)}): level={rec.level} marginal={rec.marginal}"

        )