How to check conditional constraints added to the model?

Answered

Saeid Ghafouri

March 05, 2023 20:28 Edited

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Hi Gurobi Community,

I want to know how I can check constraints like https://www.gurobi.com/documentation/current/refman/py_model_agc_indicator.html in my model using something like model.disply() function. E.g. for the following dummy example:

import gurobipy as gp

model = gp.Model()

x = model.addVar(vtype=gp.GRB.BINARY, name="x")
y = model.addVar(vtype=gp.GRB.BINARY, name="y")
a = model.addVar(vtype=gp.GRB.BINARY, name="a")


z = model.addVar(vtype=gp.GRB.CONTINUOUS, name="z", ub=30)
model.addGenConstrAnd(a, [x, y], "andconstr")

model.update()

# constr1 = model.addConstr(z <= 20)
constr2 = model.addConstr((a == 0) >> (z <= 5))

model.setObjective(z+x+y+a, gp.GRB.MAXIMIZE)

model.update()
# Solve the model
model.optimize()
model.display()

calling model.display() will only show me the following:

Maximize
  x + y + a + z
Subject To
Bounds
  0 <= z <= 30
Binaries
  ['x', 'y', 'a']

and it dos not show anything regarding:

model.addGenConstrAnd(a, [x, y], "andconstr")

or:

constr2 = model.addConstr((a == 0) >> (z <= 5))

Is there a way to see such information in Gurobi model.display() or some similar function?

Related to

• Python

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:47

  This post is more than two 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.
• 

  Riley Clement

  • Gurobi Staff

  March 07, 2023 10:03 Edited

  Hi Saeid,

  The Model.display() function is not documented, and may possibly be removed in the near future.

  The best approach is to write the model out to LP:

  model.write("my_model.lp")

  and then inspect the output in a text editor.

  - Riley

  0

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