'tupledict' object is not callable

Answered

Furkan Sezer

December 19, 2022 01:03

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I run gurobi via pyhton. I encountered 'tupledict' object is not callable error. Details are given below.  I made the line of code which caused error bold.

 

runfile('C:/gurobi1000/win64/examples/python/production_transportation.py', wdir='C:/gurobi1000/win64/examples/python')
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Traceback (most recent call last):

  File "C:\gurobi1000\win64\examples\python\production_transportation.py", line 202, in <module>
    m.addConstrs(

  File "src\gurobipy\model.pxi", line 3747, in gurobipy.Model.addConstrs

  File "C:\gurobi1000\win64\examples\python\production_transportation.py", line 203, in <genexpr>
    (production(i,j,k)==UPH(i,j)*base_prod(i,k) for i in plants for j in prod_line for k in months),"production_assignment_to_lines" )

TypeError: 'tupledict' object is not callable

Related to

• Error
• Python

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:51

  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.
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  Jaromił Najman

  • Gurobi Staff

  December 19, 2022 08:20

  Hi Furkan,

  Please note that this is not a minimal reproducible example and the help that can be provided is only limited.

  It is not clear which objects are your variables. I will assume that all 3 objects \(\texttt{production, UPH, base_prod}\) are optimization variables. As described in the documentation of tupledict

  To access the members of a tupledict, you can use standard dict indexing. For example, d[1,2] returns the value associated with tuple (1,2).

  Thus, your constraint should read

  m.addConstrs(production[i,j,k]==UPH[i,j]*base_prod[i,k] 
               for i in plants for j in prod_line for k in months),
               name="production_assignment_to_lines")

  Best regards, 
  Jaromił

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• 

  Furkan Sezer

  December 19, 2022 18:28

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  Thank you Jaromil. I will create a minimal reproducible example for future questions. 

  Best regards,

  Furkan

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