TypeError: 'gurobipy.LinExpr' object is not iterable

Answered

Geoffrey James Kameni Tchokode

March 17, 2022 18:10

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Hi,

I'm trying to code the order batching model  but i get this error. 

Can someone tell me, what is wrong?

Thks

 

 

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:41

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  Jaromił Najman

  • Gurobi Staff

  March 17, 2022 19:14

  You are using two quicksums in line 3. This line should either read

  2*quicksum(quicksum(uvar[jbatch,kaisle] for jbatch in Batch) for kaisle in G)

  or

  2*quicksum(uvar[jbatch,kaisle] for jbatch in Batch for kaisle in G)

  Best regards, 
  Jaromił

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  Geoffrey James Kameni Tchokode

  March 18, 2022 08:46

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  thks!!!

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