python in the function solve.QP for investment portfolio optimization, how do you set the constraint for long short strategy?

Question

Let's say we have 6 assets a b c d e f,

we want to long a b c d and short e f, how to set the constraints by using the solver.qp?

I am using the

import cvxopt 
from cvxopt import matrix, solvers

Answer 1

you need to set two inequality constraint each representing a min and max weight where the long will have min of 0 while the shorts will have a max of 0