Inline C in Python

In plain words

Inline C in Python is a development tool that lets programmers embed C code directly within Python scripts using quasiquotes. It's designed for Python developers who need to optimize performance-critical functions by selectively rewriting hotspots in C without abandoning Python's maintainability. The tool integrates with the CPython API and eliminates boilerplate code, enabling a gradual, function-by-function optimization approach rather than requiring full rewrites.

written from the facts on this page · September 2026

From the sources

The most fully featured quasiquoter and the the reason that this project exists is the c quasiquoter. The c quasiquoter is designed to be a way to seamlessly use the CPython API while preserving code locality and avoiding boilerplate. When optimizing python, we often find that very few functions are hotspots that require us to rewrite in c. Good practice says to start in python and then slowly port the slow functions into c one at a time. We don’t just want to rewrite all of it because then we lose the maintainability of python for a trivial gain. The c quasiquoter gives us even more fine control over which parts of our program can be in c by allowing us to weave sections of c into…from quasiquotes.readthedocs.org

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