8000 Vague warning for cbc highs dependency. Cannot have Variable objective · Issue #452 · PyPSA/linopy · GitHub
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Vague warning for cbc highs dependency. Cannot have Variable objective #452

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RobbieKiwi opened this issue May 1, 2025 · 0 comments · May be fixed by #453
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Vague warning for cbc highs dependency. Cannot have Variable objective #452

RobbieKiwi opened this issue May 1, 2025 · 0 comments · May be fixed by #453
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Version Checks (indicate both or one)

  • I have confirmed this bug exists on the lastest release of Linopy.

  • I have confirmed this bug exists on the current master branch of Linopy.

Issue Description

If you try to use CBC solver without highspy installed you get a vague "NameError"

If you try to pass a variable to add_objective, it gets caught by the type checker

Reproducible Example

# Example 1
import linopy
model = linopy.Model()
x = model.add_variables(name="x", lower=0.0)
model.add_constraints(x >= 0.0)
model.add_objective(x*1.0, sense="min")
model.solve(solver_name="cbc")  # NameError: name 'highspy' is not defined

# Example 2
import linopy
model = linopy.Model()
x = model.add_variables(name="x", lower=0.0)
model.add_constraints(x >= 0.0)
model.add_objective(x, sense="min")  # ValueError: Invalid type of `expr`

Expected Behavior

I expect to get a useful message to say that highspy should be installed to use cbc
I expect to be able to pass a Variable to the add_objective message

Installed Versions

Bottleneck==1.4.2 click==8.1.8 cloudpickle==3.1.1 colorama==0.4.6 dask==2025.4.1 deprecation==2.1.0 fsspec==2025.3.2 linopy==0.5.3 locket==1.0.0 numexpr==2.10.2 numpy==2.2.5 packaging==25.0 pandas==2.2.3 partd==1.4.2 polars==1.29.0 PuLP==3.1.1 python-dateutil==2.9.0.post0 pytz==2025.2 PyYAML==6.0.2 scipy==1.15.2 six==1.17.0 toolz==1.0.0 tqdm==4.67.1 tzdata==2025.2 xarray==2025.4.0
@RobbieKiwi RobbieKiwi added the bug Something isn't working label May 1, 2025
@RobbieKiwi RobbieKiwi linked a pull request May 1, 2025 that will close this issue
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Add useful error message for missing highspy. Allow variable objective RobbieKiwi/linopy
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