Hi I'm still pretty new in python and would like to know why this line:
RP[p][t] = demand[p][t] / fillingrate[p]
is leading to the error: KeyError: 0
it follows the relevant part of the code. Is it just a mistake of notation or what's the best way to solve it?
productname = ('milk', 'yoghurt', 'buttermilk')
fillingrate = (1.5, 1.0, 2.0)
day = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
demand = [
(5, 4, 3, 3, 4, 9, 13, 5, 4, 4, 3, 5, 10, 12),
(3, 5, 3, 5, 5, 4, 3, 4, 3, 4, 3, 4, 5, 5),
(3, 3, 5, 4, 4, 5, 4, 3, 4, 3, 4, 5, 4, 5)
]
T = range (len(day))
P = range (len(productname))
for p in P:
for t in T:
RP[P,T] = model.addVar (lb = 0, vtype = GRB.CONTINUOUS,
name = 'Regular Production[' + str(p) + ',' + str(t) + ']')
print(demand[p][t])
print(fillingrate[p])
RP[p][t] = demand[p][t] / fillingrate[p]
print(RP[p][t])
Answer
Indexing by [x, y] is absolutely not the same as indexing by [x][y]. The former results in a single dimension indexed using a tuple, whereas the latter results in a ragged 2-D array.
You will need to create a new object at the index [x] containing the values you want.