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Quansight Labs is working with the Python runtime team at Meta and stakeholders across the ecosystem to jumpstart work on converting the libraries that make up the scientific Python and AI/ML stacks to work with the free-threaded (nogil) build of CPython 3.13. Additionally, we will look at libraries like PyO3 that are needed to interface with CPython from other languages.
Our initial goal is to ensure libraries at the bottom of the stack like NumPy, pybind11, and Cython are usable with free-threaded CPython. We will also be updating packaging tools like meson-python needed to support building wheels for free-threaded CPython. Once those tools and libraries are in a stable enough state, we will begin looking at libraries higher in the stack.
This repository is for coordinating ecosystem-wide work. We will use this repository to track, understand, and provide documentation for dealing with issues that we find are common across many libraries. Issues that are specific to a project should be reported in that project's issue tracker.
Currently we suggest building CPython from source using the latest version of the CPython main branch. See the build instructions in the CPython developer guide. You will need to install needed third-party dependencies before building. To build the free-threaded version of CPython, pass --disable-gil to the configure script:
