Different way1

Let’s only have add.c , c_function.pxd , function.pyx and substraction.c.

So Let’s see the c_function.pxd and function.pyx

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## In function.pyx
from c_function cimport sum_function, substraction_function

def sum(int a, int b):
    print("sum function is called!")
    return sum_function(a, b)

def substraction(int a, int b):
    print("substraction function is called!")
    return substraction_function(a, b)

## In C_function.pxd
cdef extern from "add.c":
    int sum_function(int a, int b)

cdef extern from "substraction.c":
    int substraction_function(int a, int b)

As you can notice, the thing above don’t use header file, They are including directly from .c file.

be care of make .so file at the time.

Let’s see setup.py

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from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize

ext_modules = [Extension("operator", ["function.pyx"])]

setup(
    name="sum and substraction function",
    ext_modules = cythonize(ext_modules)
)

In here, the source part is only one, function.pyx

Different way2