gurobipy.Model object has no attribute 'addVars'

[luukve]

Hi,

I'm trying to get more familiar with the Gurobi interface in Python. I'm at a total loss why I get an error.

I have tried running some of the example files which are given in the <installation_path>/examples/python/ folder, without any problems, which leads me to think my installation was succesful.

However, as I try the following Python script:

from gurobipy import *
m = Model("Feasible schedule")
x = m.addVars(2,3)

I get the following error message:

AttributeError: 'gurobipy.Model' object has no attribute 'addVars'. 

However, changing the code to:

from gurobipy import *
m = Model("Feasible schedule")
x = m.addVar(1)

gives me no issues whatsoever. What's happening?

[Renan Garcia]

Sounds like you need to upgrade to the latest version of Gurobi, which is currently v7.0.2.

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[David Nehme]

To verify your gurobi version, you can use the "version" method on the "gurobi" object 

from __future__ import print_function

import gurobipy as grb

print(grb.gurobi.version())

grb.gurobi.version() returns a tuple, (7, 0, 2) at this time.  The addVars function was introduced in version (7, 0, 0)

[luukve]

Thanks, that did the job!

Op maandag 6 februari 2017 17:29:46 UTC+1 schreef Renan Garcia: