empty tuplelist, tupledict

[Mohammad Najarian]

Hi,

I have a model for which I first create a tuple (or dict) and the convert it to gurobipy.tuplelist (gurobipy.tupledict). I have two questions: 

Can we use the python list of tuple and dictionary instead of Gurobi types? 

Can I create an empty tuplelist or tupledict and populate it later? 

Best regards,

Matt

[Dan Jeffrey]

> Can we use the python list of tuple and dictionary instead of Gurobi types?

Yes. But the Gurobi types are more effiecient in two senses:
1. They are syntactically easier to tpye at the keyboard

2. Select functions are computationally more efficient on a tuplelist than on a list of tuples

> Can I create an empty tuplelist or tupledict and populate it later?

Yes. For example:

    tl = tuplelist()

    tl += [(1,2,3)]

    tl += [(4,5,6),(7,8,9)]

    print(tl)
output: 

    <gurobi.tuplelist (3 tuples, 3 values each):
     ( 1 , 2 , 3 )
     ( 4 , 5 , 6 )
     ( 7 , 8 , 9 )