[xkcd] Genetic Algorithms (23 Jan 2009)

[Code displayed, presumably from an IDE.]

def getSolutionCosts(navigationCode):
    fuelStopCost = 15  
    extraComputationCost = 8

[There is a giant arrow pointing to the next line.]

    thisAlgorithmBecomingSkynetCost = 999999999  
    waterCrossingCost = 45

Genetic algorithms tip:
Always include this in your fitness function.