TypeError: 'TempConstr' object is not iterable (on line 3)

Answered

Sai Krishna Reddi

March 01, 2022 05:19

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for k in range(1, 2*n):

       for y,z in zip(range(max(0, k-n), min(n, k)),range(min(n, k)-1, max(0, k-n)-1, -1)):

            name4 = model.addConstr(quicksum(x[y,z] == 1))

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:42

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• 

  Jaromił Najman

  • Gurobi Staff

  March 01, 2022 12:44

  The expression

  x[y,z] == 1

  is a constraint, in particular it's a TempConstr object. So what you are trying to do in the code snippet is to add a constraint which is a sum of constraints, which is not possible.

  Maybe you mean something like

  for k in range(1, 2*n):
    name4 = model.addConstr(quicksum(x[y,z] for y,z in zip(range(max(0, k-n), min(n, k)),range(min(n, k)-1, max(0, k-n)-1, -1))) == 1)

  Note that I am only guessing here, because your code snippet is not reproducible code.

  Best regards, 
  Jaromił

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