Provide code and infrastructure.

.gitignore

+_skbuild
+hello_world.egg-info

CMakeLists.txt

+cmake_minimum_required(VERSION 3.18)
+
+project(hello-world VERSION "1.0")
+
+find_package(pybind11)
+
+pybind11_add_module(_hello MODULE src/hello/hello.cpp)
+
+install(TARGETS _hello DESTINATION .)

pyproject.toml

+[build-system]
+requires = [
+    "setuptools>=42",
+    "wheel",
+    "pybind11[global]~=2.6.0",
+    "cmake>=3.18",
+    "scikit-build",
+]
+
+build-backend = "setuptools.build_meta"
+

setup.py

+import sys
+from skbuild import setup
+
+setup(
+    name="hello-world",
+    version="1.0",
+    description="hello world example",
+    author='MPCDF',
+    license="MIT",
+    packages=['hello'],
+    package_dir={'': 'src'},
+    cmake_install_dir='src/hello'
+)

src/hello/__init__.py

+from ._hello import hello

src/hello/hello.cpp

+#include <iostream>
+#include <pybind11/pybind11.h>
+
+namespace py = pybind11;
+
+void hello() {
+    std::cout << "Hello, World!" << std::endl;
+}
+
+PYBIND11_MODULE(_hello, m) {
+    m.doc() = "Package to say hi";
+    m.def("hello", &hello, "Prints \"Hello, World!\"");
+}