"string index out of range" error within quicksum

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Abhishek Solomon

November 19, 2022 01:37

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Hello,

The below line of code gives me an "IndexError: string index out of range" error:

for j in def_attributes:
    m.addConstr(gp.quicksum(PlayerSelect[i]*current_fitness[i]*PlayerAttributes[i,j] for i in players if position[i] == 'Defender') >= attravg['Defender']*oppfit['Defender'], 'DefenderFitnessConstraint')

I've determined its at the 'position[i] == 'Defender'' part.

If i query the 'position' variable, i get an output. For example, print (position['name']) returns a string value with the position.

How do I avoid the index error? Is there a workaround?

Thanks,

Abhishek

Related to

• Python

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  Jaromił Najman

  • Gurobi Staff

  November 21, 2022 08:33

  Hi Abhishek,

  Could you please post a minimal reproducible example? It is very hard to provide useful help with this little of information.

  You could try to isolate the error by running a \(\texttt{for}\)-loop for the \(\texttt{position[i] == 'Defender' part only}\)

  for i in players:
    print(i)
    print(position[i])
    if position[i] == 'Defender':
      print("In if-clause")

  and see what happens.

  Best regards, 
  Jaromił

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