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Explore the comprehensive effort to enable community support for free-threaded Python 3.13 in this 44-minute PyCon US conference talk. Learn about the tools, techniques, and guidance developed during the first year of porting major open source packages including Cython, NumPy, SciPy, and PyO3 to support Python's new free-threaded build. Discover practical approaches for identifying and resolving thread safety issues and multithreaded scaling bottlenecks in packages with native extensions written in C, Cython, C++, Fortran, and Rust. Gain insights from real-world experiences and anecdotes shared by the speakers as they worked to unlock scalable multithreaded parallelism across the Python ecosystem. Acquire a practical toolbox and actionable plan for supporting free-threaded Python in packages you maintain, with specific focus on native dependencies and extensions. This presentation targets developers and maintainers of Python packages with native code components, assuming prior knowledge of native Python extensions in C, C++, Rust, or Cython.
