TypeError: 'bool' object is not iterable

回答済み

芷瑜 劉

2022年04月06日 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

• 

  Jaromił Najman

  • Gurobi Staff

  2022年04月06日 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

  0

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