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Example mip1.py

This is the complete source code for our example (also available in <installdir>/examples/python/mip1.py)...

from gurobipy import *

try:

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

    # Create variables
    x = m.addVar(vtype=GRB.BINARY, name="x")
    y = m.addVar(vtype=GRB.BINARY, name="y")
    z = m.addVar(vtype=GRB.BINARY, name="z")

    # Integrate new variables
    m.update()

    # Set objective
    m.setObjective(x + y + 2 * z, GRB.MAXIMIZE)

    # Add constraint: x + 2 y + 3 z <= 4
    m.addConstr(x + 2 * y + 3 * z <= 4, "c0")

    # Add constraint: x + y >= 1
    m.addConstr(x + y >= 1, "c1")

    m.optimize()

    for v in m.getVars():
        print v.varName, v.x

    print 'Obj:', m.objVal

except GurobiError:
    print 'Error reported'

• Example details
• Creating the model
• Adding variables to the model
• Updating the model - lazy modification
• Setting the objective
• Adding constraints to the model
• Optimizing the model
• Reporting results - attributes
• Error handling
• Running the example

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Next: Example details Up: Python Interface Previous: Simple Python Example