Create a file named helloworld.pyx:
```python
def example():
    print("Hello World")
```

Create a file called setup.py:
```python
from setuptools import setup 
from Cython.Build import cythonize

setup(ext_modules = cythonize("helloworld.pyx"))
```

To compile and build the Cython file:
```python 
setup.py build_ext --inplace
```

You can now use your compiled Python extension via:
```python
import helloworld

helloworld.example()
```


Cython Example

.pyx files are python extension files that are used by python to interact directly with the C API. This consequently gives code a massive speedup. A typical .pyx file is translated into C (as a .c file) and then compiled with a C compiler into a .so file on Mac/Linux or .pyd file in Windows. This creates a dynamically-linked-library that python can use.

California State University, San Bernardino

Cython can be installed with
```
pip install cython
```
Additionally, you'll need a C compiler installed such as build-essentials (Linux), Xcode (Mac), or MinGW (Windows).


Learn Before

Related

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