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Python implements common integer values as singletons. And if you're evil or self-destructive, you could re-assign them to other values. As in, 113 == 4. Jake Vanderplas demonstrates in this article.

Comments

David Blume on May 12, 2014
To be clear, Jake uses Python for scientific computing. The trend seems to be in this direction, and so there are newcomers who are wondering if they should be concerned about Python's performance. This is how we answer that sort of question, by diving in. In practice, it appears that using Python can facilitate productivity. http://www.talyarkoni.org/blog/2013/11/18/the-homogenization-of-scientific-computing-or-why-python-is-steadily-eating-other-languages-lunch/