> For the complete documentation index, see [llms.txt](https://openai.gitbook.io/code-cheatsheets/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://openai.gitbook.io/code-cheatsheets/all/python/packages/cython.md).

# cython

A superset of python with c data types that compiles to c code

The c code it compiles to is long as fuck :(

## Basic Setup

1. Name python file to compile `.pyx`
2. In a `setup.py`,

   ```python
   from distutils.core import setup
   from Cython.Build import cythonize

   setup(
       ext_modules = cythonize("<FILENAME>.pyx")
   )
   ```
3. Run this on the command line: `python setup.py build_ext --inplace`
   1. This creates a .so and .c file
4. To use this in python just `import test`

## Variables

```python
cdef int n, i, len_p
```