import soy

...

if __name__ == '__main__':
    function = lambda x: 1/math.sqrt(
            (pos[0]-x[0])**2 + (pos[1]-x[1])**2 + (pos[2]-x[2])**2)
    dimensions = 3
    pMin = [0.0 for x in xrange(dimensions)]
    pMax = [100.0 for x in xrange(dimensions)]
    print optimize(function, dimensions, pMin=pMin, pMax=pMax)
    screen = soy.Screen()
    win = soy.Window(screen, 'Particle Swarm', backgroup=soy.colors.Black())
    key = soy.controllers.Keyboard(win)
    key['q'] = soy.actions.Quit()
    wcn = soy.controllers.Window(win)
    wcn['close'] = soy.actions.Quit()