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I am trying to use Sage's parallelization with @parallel(p_iter='fork') (I need fork specifically to work around the problems brought up here.)

If I use print to show some messages, they only appear when the parallelized function has finished. Example:

@parallel(1, timeout=10)
def fun(x): 
    print('Starting %d' % x)
    sleep(5)
    print('Finished %d' % x)
    return x*x

list(fun([2,3,4]))

The "Starting" and the "Finished" messages show up simultaneously, even though they are issued with a 5 second time difference.

How can I print a message so that it will show up immediately?

I need this when I am running a Sage script in a terminal. I am not using Sage interactively in this case and I am not using the notebook interface.