Okay that was fun. Enlightening as I hoped. unroll() in Python, for arbitrary depth, _flatten in Tkinter (what else is in Tkinter!), sum() abuse.
The sum(data,[]) was funniest, it works like ((['foo','bar'] + []) + ['my','your']) + ['holy','grail']. Before I think of such things I have already coded an algorithm in imperative style. Guess I have not been exposed to functional programming enough. -- http://mail.python.org/mailman/listinfo/python-list
