List comprehension syntax in addGenConstrAnd type of constraints

Answered

Madhushini Narayana Prasad

February 07, 2022 20:51

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Hi,

I need to model a constraint which is like --> y is true if x is true and z[i] are true for i in lst_i.

What is the best way to model this constraint using gurobipy?

I am using 'addGenConstrAnd' construct within a for loop for every i in lst_i, but I am sure there exists an elegant way to model the list comprehension within addGenConstrAnd/ addGenConstrOr type of constraints. Any help is appreciated!

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:44

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  Maliheh Aramon

  • Gurobi Staff

  February 08, 2022 04:23

  Hi Madhushini,

   

  You can first build the list of variables over which the AND concatenation will be taken and then use the Model.addGenConstrAnd() method.

  vars = [x]
  vars.extend([z_i for i in lst_i])
  model.addGenConstrAnd(y, vars, name="and")

  Best regards,

  Maliheh

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  Madhushini Narayana Prasad

  February 08, 2022 23:35

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  Thank you, that works!

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