Is there a Python syntax to write/export a model as mps file using Highspy?

[hbshrestha]

The HIGHS documentation provides a simple example of building a model using highspy.
Is there an option to write or export mps file from the below given model using highspy?

import highspy
import numpy as np
h = highspy.Highs()

x0 = h.addVariable(lb = 0, ub = 4)
x1 = h.addVariable(lb = 1, ub = 7)

h.addConstr(5 <=   x0 + 2*x1 <= 15)
h.addConstr(6 <= 3*x0 + 2*x1)

h.minimize(x0 + x1)

[jajhall]

Yes, h.writeModel("foo.mps")

[hbshrestha]

The mps file is not exported due to the error message in my view.

[jajhall]

Indeed, if there are duplicate names, the MPS file won't be created.

For me the question is why there are duplicate names. If HiGHS creates them, they should be guaranteed to be distinct, which is why I asked whether you define them

[hbshrestha]

I didn't define the variable names in the code above. I realized that the names have to specified manually as a separate parameter.
By assigning name = "x0" and name = "x1", I could finally resolve this error and export mps file.

x0 = h.addVariable(lb=0, ub=4, name="x0")
x1 = h.addVariable(lb=1, ub=7, name="x1")

[jajhall]

Thanks. What this tells me is that the default empty name of "" is being stored for each name in HiGHS, so it considered there to be duplicate names. I need to check that empty names aren't stored in this way

[hbshrestha]

Indeed, that's correct.