Python's upcoming 3.13 release is a big one – here's all the important stuff you need to know if you're thinking of upgrading, including implications of changes to the Global Interpreter Lock (GIL) and Just-in-Time (JIT) compilation.

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Python 3.13, slated for release on October 2nd, 2024, introduces two significant enhancements: the option to disable the Global Interpreter Lock (GIL) for free-threaded execution and experimental Just-in-Time (JIT) compilation. These changes aim to improve Python's performance for both single-threaded and multi-threaded applications. The GIL can be disabled to allow concurrent execution of multiple threads, although this comes with a performance penalty for single-threaded tasks. The JIT compiler aims to optimize bytecode execution but remains in an experimental phase, with more sophisticated optimizations expected in the future.

Everything you need to know about Python 3.13 – JIT and GIL went up the hill