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Hello, PNG
PNG is my favourite file format of all time. Version 1.0 of the specification was released in 1996 (before I was born!) and the format remains widely used to this day. I think the main reasons it stuck around for so long are:
David Buchanan
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SIMD in Pure Python
First of all, this article is an exercise in recreational "because I can" programming. If you just want to make your Python code go fast, this is perhaps not the article for you. And perhaps Python is not the language you want, either!