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• Python Patterns - An Optimization Anecdote

  ...ord, string) and the somewhat less obvious: import array def g2(string): return array.array('b', string).tolist() Timing these reveals that g2() is about five times as fast as g1(). There's a catch though: g2() returns integers in the range -128..127, while g1() returns integers in the range 0..255. If you need the positive integers, g1() is going to be faster than anything postprocessing you could do on the result from g2(). (Note: since this essay was wr...

• Notes

  ...orderings. Classes or types that want to implement (in)equality tests but not the ordering operators (i.e. unordered types) should implement == and !=, and raise an error for the ordering operators. It is possible to define types whose rich comparison results are not Boolean; e.g. a matrix type might want to return a matrix of bits for A < B, giving elementwise comparisons. Such types should ensure that any interpretation of their value in a Boolean context raises an exception, e.g. by defin...

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