Python 3.15 is expected to speed up some programs and simplifies handling immutable data. UTF-8 as standard requires testing.

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Python 3.15 introduces lazy imports, UTF-8 as the default encoding, faster experimental JIT performance, and new profiling ...

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This is the Python material that does not get left behind. Almost none of it is replaced by a framework later. Learn it, and keep this cheat sheet close by as a handy reference.