import stackless
import pickle

def squareroot(x):
    # newtonverfahren
    print
    print "Wurzel aus",x
    print "-------------"
    i = 0
    y = x
    print i, ":", y
    while True:
        i += 1
        y = (y + x/y)/2.0
        print i, ":", y
        stackless.schedule()

if __name__ == '__main__':
    import sys
    x = float(sys.argv[1])
    task = stackless.tasklet(squareroot)(x)

    stackless.schedule()
    stackless.schedule()

    print 'pickle'
    pickled_task = pickle.dumps(task)
    task.remove()

    print 'unpickle'
    newtask = pickle.loads(pickled_task)
    newtask.insert()

    stackless.schedule()
    stackless.schedule()