Web Reference: Nov 15, 2023 · Cython rather than Cypthon? Cython is not a culprit in itself, it's the reluctancy of PyYAML to support Cython 3, which was announced years in advance, and which is now very widely adopted. meanwhile PyYAML has fixed the incompatibility with Cython 3, you just need to use a newer version of it. May 7, 2025 · We’ve seen how AttributeError: cython_sources usually emerges from PyYAML’s conflict with Cython ≥ 3.0. Let’s now go through the different strategies to resolve this issue. Jan 12, 2022 · It's definitely a regression between Cython 3.0.0a9 and a10; every previous 3.0.0 alpha has been able to build the pyyaml extension fine. This PR (included in a10) swapped out the base class on Cython's custom build_ext distutils command (which pyyaml further subclasses to customize some stuff).
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