TypeError: 'bool' object is not iterable

Answered

芷瑜 劉

April 06, 2022 13:17

• 
• 

I met a problem when I worked on my homework.

The constraint I want to add is below : 

And my code look like this : 

case.addConstrs(
    (quicksum(x[j][k] for k in range(2, K + 1))
    for j in range(J) == 1), 'Each job one machine'
)

The result show up :

What is the problem in my code?

p.s I'm not sure whether my question is clear enough.

0

• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:40

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  Jaromił Najman

  • Gurobi Staff

  April 06, 2022 14:20

  When using the addConstrs method, you have to generate a list of constraints. Thus, you have to move your last \(\texttt{for}\)-loop after the \(\texttt{== 1}\) part

  case.addConstrs(
      (quicksum(x[j][k] for k in range(2, K + 1))
       == 1 for j in range(J)), 'Each job one machine'
  )

  Best regards, 
  Jaromił

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