Cython is an essential bridge between C and Python, enabling developers to write C extensions. The upcoming Cython 3.1 release promises significant improvements, including new type annotation features and free-threading support.
The introduction of free-threaded Python 3.13t allows CPU-bound threads to execute in true parallel, overcoming limitations associated with the global interpreter lock. This experimental feature is key for performance boosts.
Cython 3.1's basic support for the experimental 3.13t build indicates that developers can experiment with true parallelism via straightforward Cython extensions, albeit with necessary precautions in production.
Developers need to follow specific steps—installing the pre-release Cython on 3.13t and understanding build instructions—to effectively create free-threaded Cython modules that can function without the restrictions of the GIL.
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