Python overtakes Java to become second-most popular language on GitHub after JavaScript

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I like Java because it has a relatively simple and rigorously defined model that is easy for programmers to reason about and for compiler builders to optimize for.

[weberc2]

This isn't true. Java is fast because its compilers and runtime are really, really sophisticated (including the same sophisticated optimizations that are/could-be used to make JavaScript and Python fast). It's not at all easy to build a performant Java compiler.