apis/examples_python/gt__example2_8py_source.html

import os

import sys

from gams import GamsWorkspace

import gams.transfer as gt


if __name__ == "__main__":

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

    ws = GamsWorkspace(system_directory=sys_dir)


    ws.gamslib("trnsport")

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

    job.run()


    m = gt.Container(

        os.path.join(ws.working_directory, job.out_db.name + ".gdx"), sys_dir

    )


    # some GDX attributes are available right away, but the data needs to be loaded

    print(f"m.listSymbols(): {m.listSymbols()}")  # get all symbols in GDX

    print(f"m.listSets(): {m.listSets()}")  # get all sets in GDX file

    print(f"m.listParameters(): {m.listParameters()}")  # get all parameters in GDX file

    print(f"m.listVariables(): {m.listVariables()}")  # get all variables in GDX file

    print(f"m.listEquations(): {m.listEquations()}")  # get all equations in GDX file


    # get access to the data structures

    print(f"m.data['i'].summary: {m.data['i'].summary}")

    print(f"m.data['i'].records:\n{m.data['i'].records}")


    # add new data

    t = gt.Parameter(

        m,

        "t",

        ["*"],

        records=[("t" + str(i), i) for i in range(10)],

        description="new data",

    )


    # write the GDX file

    m.write("transport_out.gdx")