setup.py

from pathlib import Path
from setuptools import setup, find_packages
from setuptools.command.build_py import build_py


class BuildPy(build_py):
    def run(self):
        super().run()

        name = "magic_codec.pth"
        input_file = Path("src") / name
        output_file = Path(self.build_lib) / name

        # install path configuration file
        self.copy_file(str(input_file), str(output_file), preserve_mode=0)


setup(
    name="magic_codec",
    version="0.0.1",
    description="Extensible codec that can be used to drastically change the behavior of the Python interpreter.",
    author="Tsche",
    author_email="contact@palliate.io",
    package_dir={'': 'src'},
    packages=find_packages(where='src'),
    include_package_data=True,
    cmdclass={"build_py": BuildPy}
)