What are Cython extensions and how do I use them?

What are Cython extensions and how do I use them?

Cython extensions are modules written in Cython, a programming language that makes writing C extensions for Python easier. They allow you to write Python code that can be compiled into C for performance improvements.

How do I install Cython?

You can install Cython using pip. Just run pip install cython in your terminal.

Can you give me an example of a simple Cython extension?

Sure! Here's a simple example:

# my_extension.pyx
def add(int a, int b):
    return a + b

You would then create a setup.py file to compile it.

What do I need in the setup.py file?

Your setup.py file should look like this:

from setuptools import setup, Extension

ext_modules = [Extension('my_extension', ['my_extension.pyx'])]
setup(name='MyExtension', ext_modules=ext_modules)

Then run python setup.py build_ext --inplace to compile it.