In old days, I used setup.py to build my project which hybird cython and plain python. Recently, I’ve heard that using setup.py to build is not recommend, and pip will remove the support of it recently.

Therefore I decided to migrate to uv, uv recommend me to use scikit-build-core to build cython project. I tried, and successful built a project contains only cython files. But I failed to build a project hybird cython and python.

I tried to use cmake script, but I’ve only succeed in building b.pyx, but not c/e.pyx.

setup.py script:

from setuptools import setup
from Cython.Build import cythonize

setup(
    name='example',
    version='0.0.1',
    packages=['example', "example.c"],
    url='',
    license='',
    author='Colinxu2020',
    author_email='',
    description='',
    ext_modules=cythonize("src/example/**/*.pyx", annotate=True, language_level = "3")
)

CMakeLists.txt

cmake_minimum_required(VERSION 3.21)
project(${SKBUILD_PROJECT_NAME} LANGUAGES CXX)

find_package(
  Python
  COMPONENTS Interpreter Development.Module
  REQUIRED)
include(UseCython)

#file(GLOB_RECURSE pyx_files src/example/*.pyx)
#foreach(pyx_file ${pyx_files})
#  set(cpp_file)
#  message(${pyx_file})
#  cython_transpile(${pyx_file} LANGUAGE CXX OUTPUT_VARIABLE cpp_file)
#  string(REGEX REPLACE ".pyx" "" output_name ${pyx_file})
#  python_add_library(${output_name} MODULE WITH_SOABI "${cpp_file}") 
#endforeach()
cython_transpile(src/example/b.pyx LANGUAGE CXX OUTPUT_VARIABLE cpp_files)
python_add_library(testcase MODULE WITH_SOABI "${cpp_files}")
install(TARGETS example DESTINATION ${SKBUILD_PROJECT_NAME})

pyproject.toml

[project]
name = "example"
version = "0.1.0"
description = "Add your description here"
authors = [
    { name = "Colinxu2020", email = "[email protected]" }
]

[tool.scikit-build]
minimum-version = "build-system.requires"
build-dir = "build/{wheel_tag}"

[build-system]
requires = ["scikit-build-core>=0.10", "cython", "cython-cmake"]
build-backend = "scikit_build_core.build"

My source file structed like:

• a.py
• b.pyx
• c
  • d.py
  • e.pyx

When using pure setup.py, the whl contains:

• a.py
• b.pyd
• c
  • d.py
  • e.pyd

But when using scikit-build-core, I get the following result.

• a.py
• c.pyx
  • d.py
  • e.pyx