TypeError: list indices must be integers, not tuple

[ชวิศ บุญมี]

How I can solve this problem?

I just have started to use it, So I would like some advise.

The error is

Traceback (most recent call last):
  File "C:/Users/proje201/Desktop/python/test3", line 39, in <module>
    m.addConstr(y[i,j]*d[i,j]<=30,"Limit_distance_%s_%s"%(i,j))
TypeError: list indices must be integers, not tuple

May be have some problem with parameter "d"

that I input

d = [[10,20,30],
    [20,30,10],
    [30,10,20],
    [10,40,30],
    [40,10,20]]

Please recommend and solve this problem for me

I have attached file in this email too.

best regards

[Renan Garcia]

In your case, y is a dictionary of variables, where the keys are tuples. Thus, you would refer to a specific variable using y[i,j].

However, d is a list of lists of coefficients. Therefore, you must refer to a specific coefficient using d[i][j].

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