# list of nodes
nodes = [1,2,3,4]

# supply or demand of nodes
            #NodeID : [Supply,Demand]
nodeData = {1:[5,0],
            2:[0,0],
            3:[0,0],
            4:[0,5]}



# arcs list
arcs = [ (1,2),
         (1,3),
         (2,3),
         (2,4),
         (3,4)]

# arcs cost, lower bound and capacity
            #Arc : [Cost,MinFlow,MaxFlow]
arcData = { (1,2):[2,0,4],
            (1,3):[2,0,2],
            (2,3):[1,0,2],
            (2,4):[3,0,3],
            (3,4):[1,0,5] }



WYNIK :
('Route_(1,_2)', '=', 3.0)
('Route_(1,_3)', '=', 2.0)
('Route_(2,_3)', '=', 2.0)
('Route_(2,_4)', '=', 1.0)
('Route_(3,_4)', '=', 4.0)
('Total Cost of Transportation = ', 19.0)