Gurobi TypeError: __init__() takes exactly 3 positional arguments (4 given)

回答済み

juan raposo picos

2023年05月16日 03:22

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Hi,

I'm coding an optimization AbstractModel, and if I use gurobi as a solver, when running the variable declaration I find the following error message on my Jupyter Notebook. Could someone explain to me why is that?

Best regards,

Juan

 

関連

• Error
• Pyomo

0

• 

  Riley Clement

  • Gurobi Staff

  2023年05月16日 07:08

  Hi Juan,
  
  I think this problem is due to you trying to use both Pyomo and gurobipy and getting a namespace clash.  It looks like you are trying to define a Pyomo variable, but it is trying to create a gurobipy variable instead and fails due to the method signatures being different.

  Are you perhaps using

  from gurobipy import *
  from pyomo import *

  in your code?

  In general it is bad practice to import functionality like this.  Instead use

  import gurobipy as gp
  import pyomo as pyo

  and then gp.Var and pyo.Var will be different things, and you don't have ambiguity, or one overwriting the other.

  - Riley

  1

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