Namespace packages support 420

[clamydo]

According to the README, this feature is planned. Can you say something about the status please?

What is necessary to implement this feature?

Thank you for this very useful package!

[tttapa]

Version 0.2.0a8 adds experimental namespace package support.

[clamydo]

Awesome and thank you! My first experiments with it were successful. I'm still playing around with the setup though. I'll get back to you if I'm stumbling with it.

[clamydo]

I have a project structure like:

CMakeLists.txt
pyproject.toml
cpp/
  ...
python/
  foobar/
    blu/
       bla/
         __init__.py

and a pyproject.toml like:

[project] # Project metadata
name = "blu.bla"
requires-python = ">=3.8"
license = { "file" = "LICENSE" }
authors = [{ "name" = "bla", "email" = "bla@example.com" }]
dependencies = [
  "pyarrow~=13.0",
]
# dynamic = ["version", "description"]
version = "0.0.dev"

[build-system] # How pip and other frontends should build this project
requires = [
  "py-build-cmake~=0.2.0a8",
  "pybind11~=2.11",
  "pyarrow~=13.0",
]
build-backend = "py_build_cmake.build"

[tool.py-build-cmake.module] # Where to find the Python module to package
directory = "python/foobar"
name = "blu/bla"
namespace = true

[[tool.py-build-cmake.cmake]] # How to build the CMake project
minimum_version = "3.16"
build_type = "Debug"
source_path = "."
build_args = ["--target", "python_extension_target"]
install_args = ["--strip"]
install_components = ["python_modules"]

[tool.py-build-cmake.stubgen] # Whether and how to generate typed stub files

[tool.py-build-cmake.editable]
mode = "symlink"

and I get

  ❌ Error in user configuration:

                Namespace packages should not contain __init__.py (in /home/user/project/python/foobar/blu/bla)

But according to https://packaging.python.org/en/latest/guides/packaging-namespace-packages/ an __init__.py in this position should be legal. Just at the namespace level python/foobar no __init__.py is allowed.

Am I doing something wrong?

[tttapa]

I initially intended directory and name to point to the parent namespace package only. But py-build-cmake should support your use case as well. I'll see if I can implement something next week.