Making C and Python Talk to Each Other
Published on: 2025-06-12 12:06:10
1.0 Introduction
Summary of calling Python from C and C from Python
LeetArxiv is Leetcode for implementing Arxiv and other research papers. We code lots of research papers and these tend to be in C and Python*. Due to popular demand, we wrote this comprehensive guide to interfacing between these languages.
*Foundational research papers (✨from before the 2000's✨) tend to be in C while modern AI research papers are in Python.
This practical coding guide demonstrates how to : Call Python from C and embed Python scripts in your C codebase.
We’ll start from the complete basics.
2.0 Calling Python inside C
Say you have a Python file, let’s call it PythonFunctions.py . Now you want to use these functions inside a C file, let’s call this C main.c .
We assume you’re working on Linux or a Mac*. We also assume you have Python 3 and GCC available on your system.
*Using C on Windows is pretty cumbersome lol
2.1 Locating Python.h
You need to include Python.h inside your C to file to proce
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