setup.py

import codecs
import os.path

from setuptools import setup, find_packages, Extension
from distutils.command.build_ext import build_ext as build_ext_orig

#  https://stackoverflow.com/questions/4529555/building-a-ctypes-based-c-library-with-distutils
class build_ext(build_ext_orig):
    def build_extension(self, ext):
        self._ctypes = isinstance(ext, Extension)
        return super().build_extension(ext)

    def get_export_symbols(self, ext):
        if self._ctypes:
            return ext.export_symbols
        return super().get_export_symbols(ext)

    def get_ext_filename(self, ext_name):
        if self._ctypes:
            return ext_name + '.so'
        return super().get_ext_filename(ext_name)

"""Reading version as proposed in https://packaging.python.org/guides/single-sourcing-package-version/"""
def read(rel_path):
    here = os.path.abspath(os.path.dirname(__file__))
    with codecs.open(os.path.join(here, rel_path), 'r') as fp:
        return fp.read()
def get_version(rel_path):
    for line in read(rel_path).splitlines():
        if line.startswith('__version__'):
            delim = '"' if '"' in line else "'"
            return line.split(delim)[1]
    else:
        raise RuntimeError("Unable to find version string.")

# Generate Python library
try:
    setup(
        name="PyMKL",
        description="Multiple Kernel Learning implementation for Python",
        url="https://github.com/gjimenez/PyMKL",
        author="Guillermo Jimenez-Perez",
        author_email="<guillermo@jimenezperez.com>",
        # Needed to actually package something
        packages=find_packages(),
        # Needed for dependencies
        install_requires=["numpy", "scipy", "picos", "cvxopt", "joblib", 
                        "pandas", "tqdm", "scikit-learn", "networkx", "numba", 
                        "sak @ git+https://github.com/guillermo-jimenez/sak.git"],
        # *strongly* suggested for sharing
        version=get_version("PyMKL/__init__.py"),
        # The license can be anything you like
        classifiers=[
            "Programming Language :: Python :: 3",
            "License :: OSI Approved :: GNU General Public License",
            "Operating System :: OS Independent",
        ],
        python_requires='>=3.6',
        py_modules = ["libPyMKL"],
        ext_modules=[
            Extension(
                "PyMKL/lib/cpp/libPyMKL",
                ["PyMKL/lib/cpp/libPyMKL.c",],
            ),
        ],
        cmdclass={'build_ext': build_ext},
    )
except (Exception, SystemExit):
    setup(
        name="PyMKL",
        description="Multiple Kernel Learning implementation for Python",
        url="https://github.com/gjimenez/PyMKL",
        author="Guillermo Jimenez-Perez",
        author_email="<guillermo@jimenezperez.com>",
        # Needed to actually package something
        packages=find_packages(),
        # Needed for dependencies
        install_requires=["numpy", "scipy", "picos", "cvxopt", "joblib", 
                        "pandas", "tqdm", "scikit-learn", "networkx", "numba", 
                        "sak @ git+https://github.com/guillermo-jimenez/sak.git"],
        # *strongly* suggested for sharing
        version=get_version("PyMKL/__init__.py"),
        # The license can be anything you like
        classifiers=[
            "Programming Language :: Python :: 3",
            "License :: OSI Approved :: GNU General Public License",
            "Operating System :: OS Independent",
        ],
        python_requires='>=3.6'
    )