gurobi_2.py

#Add constraints to the model

#The values
x = knapsack_model.addVars(N, vtype = GRB.INTEGER, name="x")

#The total cost must be inferior to our budget
knapsack_model.addConstr(sum(cost_dollars[i]*x[i] for i in range(N)) <= total_budget)

#Minimum for each aspect must be filled
knapsack_model.addConstrs(x[i] >= minimum_time[i] for i in range(N))

#Maximum for each aspect must be respected
knapsack_model.addConstrs(x[i] <= maximum_time[i] for i in range(N))

#Sum of hours must be equal to total possible hours
knapsack_model.addConstr(sum(x[i] for i in range(N)) == total_hours)