cython/cython

Health v2 · maintenance only

Adoption not part of the score

10833 stars · 1618 forks observed · 2026-08-28

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

Cython is an optimising static compiler that translates Python and the extended Cython language into C/C++ code for building fast CPython extension modules. It supports static type declarations, calling C/C++ functions directly, and wrapping external C libraries.

Use cases

• speed up slow Python code by compiling it to C
• wrap an existing C or C++ library for use from Python
• add static type declarations to performance-critical Python functions
• work efficiently with large NumPy arrays and numerical data
• embed CPython into existing C/C++ applications
• write parallel code that releases the GIL

When to choose

• you need orders-of-magnitude speedups for hot paths in CPython code
• you must interoperate with C/C++ libraries from Python
• you want a mature, widely used tool with broad CPython version compatibility
• you need fine-grained control over generated C code

When to avoid

• you want a JIT with no build step (consider Numba or PyPy)
• your code is I/O-bound and not CPU-bound
• you target non-CPython runtimes exclusively
• you want full Python language compliance without limitations

Facets

cli-tool · maturity stable

compiler programming-language build-tool programming-languages compilers performance developer-tools python cpp cross-platform python-to-c c-extensions static-typing cpython numpy performance-optimization compiler

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