I am running an LP using pulp but getting the error AttributeError: 'NoneType' object has no attribute 'actualSolve'. So I found this post on determining the solvers that are available. This directed me to try the code below. import pulp print(pulp.listSolvers()) print(pulp.listSolvers(onlyAvailable=True)) The first print statement gives me a list of solver, but the second statement gives me an empty list. [] I also uninstalled pulp with pip uninstall pulp and then reinstalled it. Next I found this page and tried to install the solver directly with solver = pl.getSolver('CPLEX_CMD'). I did this all in VS Code. Then, just to see if I was just crazy I tried by LP in Google Colab and it worked no problem. What am I missing so that it works in one IDE but not in another? Below is the code for my LP: from pulp import LpProblem, LpMinimize, LpVariable, LpConstraint, lpSum, value # Define the problem prob = LpProblem("Minimize_Operating_Cost", LpMinimize) # Define decision variables x1 = LpVariable("Hours_Facility_1", lowBound=0) x2 = LpVariable("Hours_Facility_2", lowBound=0) # Objective function: Minimize cost prob += 120 * x1 + 220 * x2, "Total_Cost" # Constraints prob += 300 * x1 + 350 * x2 >= 4500, "Regular_Detergent_Constraint" prob += 220 * x1 + 450 * x2 >= 5200, "Concentrate_Detergent_Constraint" # Solve the problem prob.solve() # Extract results x1_opt = value(x1) x2_opt = value(x2) min_cost = value(prob.objective) # # Display results x1_opt, x2_opt, min_cost Continue reading...
