iplitharas / myCython

Cython

Compile Cython/Python code

The pipeline consist of two stages:

• The cython compiler, compiles any C/Python code to C/C++, platform independent

• The second stage compiles the generated C or C++ source into a shared library with a standard C or C++ compiler. The result shared library is platform dependent. .so or pyd for windows. The flags passed to the C or the C++ compiler ensures this shared library a full Python module

Using distutils.

from setuptools import setup
from Cython.Build import cythonize

setup(
    name='Hello world app',
    ext_modules=cythonize("hello.pyx"),
    zip_safe=False,
)

Build the python module using. python setup.py build_ext --inplace

import hello
hello?
Type:        module
String form: <module 'hello' from '/home/ioannis/projects/myCython/hello_world/hello.cpython-38-x86_64-linux-gnu.so'>
File:        ~/projects/myCython/hello_world/hello.cpython-38-x86_64-linux-gnu.so
Docstring:   Pure Cython script for hello world

Using iPython.

%load_ext Cython
%%cython 
def fib(int n):
    cdef int i 
    cdef double a=0.0 b=1.0
    for i in range(n):
        a, b = a+b , a
    return a

Cython Standalone executables

• cython some_script.py
• gcc $(python-config --cflags) $(python-config --ldflags) ./some_script.c