microsoft/Pyjion

Health v2 · maintenance only

Flags: no_releases archived

Adoption not part of the score

1592 stars · 133 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Pyjion is a just-in-time (JIT) compilation library for CPython built on the .NET CoreCLR JIT compiler, exposed through a C API that allows JIT engines to be plugged into CPython. It also provides a C++ framework to make it easier to write alternative JIT implementations targeting that API.

Use cases

• speed up cpython execution with a jit
• plug a jit compiler into cpython via a c api
• build a custom jit for python
• keep full c extension module compatibility while jitting python code
• compare python jit implementations like pypy pyston and numba

When to choose

• you want to experiment with JIT compilation of CPython bytecode using CoreCLR
• you need CPython C extension compatibility that PyPy cannot provide
• you are researching or prototyping pluggable JIT architectures for Python

When to avoid

• you need an actively maintained or production-ready Python JIT - development has moved to tonybaloney/Pyjion and this repo's last release was 2020
• you want a drop-in faster Python interpreter like PyPy for general use
• you only need numeric/scientific code acceleration, where Numba is more mature

Facets

library · maturity abandoned

compiler interpreter developer-tools programming-languages compilers performance developer-tools python cpp cross-platform windows jit cpython coreclr dotnet python-runtime pluggable-jit linux macos

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markdown · JSON · MCP: product_card(name="microsoft/Pyjion")