How to build a universal wheel with pyproject.toml

Question

This is the project directory structure

.
├── meow.py
└── pyproject.toml

0 directories, 2 files

This is the meow.py:

def main():
    print("meow world")

This is the pyproject.toml:

[build-system]
requires = ["setuptools"]
build-backend = "setuptools.build_meta"

[project]
name = "meowpkg"
version = "0.1"
description = "a package that meows"

[project.scripts]
meow_world = "meow:main"

When building this package, no matter whether with python3 -m pip wheel . or using python3 -m build, it creates a file named like meowpkg-0.1-py3-none-any.whl which can not be installed on Python 2.

$ python2.7 -m pip install meowpkg-0.1-py3-none-any.whl
ERROR: meowpkg-0.1-py3-none-any.whl is not a supported wheel on this platform.

But "meowpkg" actually works on Python 2 as well. How to instruct setuptools and/or wheel to create a universal wheel tagged like meowpkg-0.1-py2.py3-none-any.whl, without using the old setup.cfg/setup.py ways?

Current workaround:

echo "[bdist_wheel]\nuniversal=1" > setup.cfg && python3 -m build && rm setup.cfg

Answer 1

Add this section into the pyproject.toml:

[tool.distutils.bdist_wheel]
universal = true