setup.py

# Available at setup time due to pyproject.toml
import tomllib
from pathlib import Path

from pybind11.setup_helpers import Pybind11Extension, build_ext
from setuptools import setup

with Path(__file__).with_name("pyproject.toml").open("rb") as f:
    __version__ = tomllib.load(f)["project"]["version"]

# The main interface is through Pybind11Extension.
# * You can add cxx_std=11/14/17, and then build_ext can be removed.
# * You can set include_pybind11=false to add the include directory yourself,
#   say from a submodule.
#
# Note:
#   Sort input source files if you glob sources to ensure bit-for-bit
#   reproducible builds (https://github.com/pybind/python_example/pull/53)

ext_modules = [
    Pybind11Extension(
        "python_example",
        ["src/main.cpp"],
        # Example: passing in the version to the compiled code
        define_macros=[("VERSION_INFO", __version__)],
    ),
]

setup(
    ext_modules=ext_modules,
    # Currently, build_ext only provides an optional "highest supported C++
    # level" feature, but in the future it may provide more features.
    cmdclass={"build_ext": build_ext},
)