# GuRoBi Python example from
# http://www.gurobi.com/doc/45/quickstart/node11.html
from gurobipy import *

try:

  # Create a new model
  m = Model("mip1")

  # Create variables
  x = m.addVar(0.0, 1.0, -1.0, GRB.BINARY, "x")
  y = m.addVar(0.0, 1.0, -1.0, GRB.BINARY, "y")
  z = m.addVar(0.0, 1.0, -2.0, GRB.BINARY, "z")

  # Integrate new variables
  m.update()


  # Add constraint: x + 2 y + 3 z <= 4
  m.addConstr(LinExpr([1.0, 2.0, 3.0], [x, y, z]), GRB.LESS_EQUAL, 4.0, "c0")

  # Add constraint: x + y >= 1
  m.addConstr(LinExpr([1.0, 1.0], [x, y]), GRB.GREATER_EQUAL, 1.0, "c1")

  m.optimize()

  for v in m.getVars():
    print v.VarName, v.X

  print 'Obj:', m.ObjVal

except:
  print 'Error reported'