<a href="http://news.ycombinator.com/item?id=1745322" rel="nofollow">http://news.ycombinator.com/item?id=1745322</a> <- Previous submission of this item<p><a href="http://news.ycombinator.com/item?id=1746916" rel="nofollow">http://news.ycombinator.com/item?id=1746916</a> <- Follow-up : "(How to Write a ((Better) Lisp) Interpreter (in Python))"<p>Some discussion on each.