Python sets and dictionaries can have quadratic-time performance
(news.ycombinator.com)
1.
2.
High-Performance Array-Backed LRU Hash Table
(news.ycombinator.com)
3.
A concrete explanation of how a cache works
(news.ycombinator.com)
4.
My thoughts after using Clojure for about a month
(news.ycombinator.com)