'gurobipy.QuadExpr' object is not iterable

Answered

Felicity Sung

October 19, 2022 08:19 Edited

I have trouble for fixing this problem! Plz help for figuring out what the problem is!!! Tks!!!!!

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2 comments

Official comment
Simranjit Kaur

Gurobi Staff

November 16, 2025 23:26
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Jaromił Najman

Gurobi Staff

October 20, 2022 08:36
There are a few issues here.
```
quicksum(T[j])
```
tries to access the one element \(\texttt{T[j]}\) but \(\texttt{j}\) is not defined.

In
```
for j in job + PM*YPM[j] for j in job
```
the index variable \(\texttt{j}\) is defined twice. This may lead to any kind of errors. Moreover, it is not visible from the screenshot you posted whether \(\texttt{job + PM*YPM[j]}\) even works.

You could try
```
quicksum(T[j] for j in job)
```
If this does not work, please provide a minimal reproducible example (not just a screenshot).

Best regards,
Jaromił
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