Supported C API Extensions

The table below lists C API extensions with pre-built pip wheels that are compatible with "nogil" Python. Linux and Windows wheels are for x86-64. MacOS wheels support both x86-64 (Intel) and ARM.

Note that even the "supported" extensions are not well tested. Please file GitHub issue if you run into any problems.

Extension	Linux	macOS	Windows
bitarray	✅	✅	✅
blis	✅	✅	✅
cffi	✅	✅	✅
cryptography	✅
cymem	✅
cython	✅	✅	✅
h5py	✅
jax	✅
kiwisolver	✅	✅	✅
llvmlite	✅
lxml	✅
markupsafe	✅	✅	✅
matplotlib	✅	✅	✅
numexpr	✅	✅	✅
numpy	✅	✅	✅
opencv-python	✅
orjson	✅	✅	✅
pglast	✅
pillow	✅	✅	✅
psycopg2-binary	✅
pybind11	✅	✅	✅
pydantic	✅	✅	✅
pytorch	✅	✅
scikit-learn	✅	✅
scipy	✅	✅
spacy	✅
thinc	✅
torchvision	✅

Unsupported extensions

• Aspose.Email-for-Python-via-NET (closed source, incompatible native binaries)
• Numba (incompatible byte code changes)

Notes

Wheels are primarily built using the GitHub actions workflows at https://github.com/colesbury/nogil-wheels.

Jax

Seems to work, but I'm not sure about using Jax from multiple threads. Need someone with Jax expertise.

Numba

The interpreter.py file needs to be updated for the nogil interpreter's bytecode.

PyArrow

I haven't figured out how to build it from source yet.

PyTorch

Believed to work well.