Setup.py to pyproject.toml

setuptopyproj.py

# Just having fun, don't take this to seriously :p

import sys
import importlib


def new_module(mod_name):

    spec = importlib.machinery.ModuleSpec(mod_name,None)
    return importlib.util.module_from_spec(spec)

def create_module(mod_name, object_list):

    mod = new_module(mod_name)
    for obj in object_list:
        setattr(mod,obj.__name__, obj)

    return mod


_SAVED_KWARGS = {}

def do_stuf():
    def setup(*args, **kwargs):
        global _SAVED_KWARGS
        _SAVED_KWARGS = kwargs

    def find_packages(*args, **kwargs):
        return "list"

    return create_module("setuptools", [
        setup,
        find_packages
    ])

from setuptools import find_packages, setup
sys.modules['setuptools'] = do_stuf()



###########

import setup  # Import the local file

HEADER = """[build-system]
requires = ["setuptools ~= 58.0"]

[project]
"""

print(HEADER)
for name, value in _SAVED_KWARGS.items():
    print(f"{name} = {value}")

First version does something like:

[build-system]
requires = ["setuptools ~= 58.0"]

[project]

name = azure-core
version = 1.26.3
include_package_data = True
description = Microsoft Azure Core Library for Python
long_description = 
# Azure Core shared client library for Python

Azure core provides shared exceptions and modules for Python SDK client libraries.
These libraries follow the [Azure SDK Design Guidelines for Python](https://azure.github.io/azure-sdk/python/guidelines/index.html) .

long_description_content_type = text/markdown
license = MIT License
author = Microsoft Corporation
author_email = [email protected]
url = https://github.com/Azure/azure-sdk-for-python/tree/main/sdk/core/azure-core
classifiers = ['Development Status :: 5 - Production/Stable', 'Programming Language :: Python', 'Programming Language :: Python :: 3 :: Only', 'Programming Language :: Python :: 3', 'Programming Language :: Python :: 3.7', 'Programming Language :: Python :: 3.8', 'Programming Language :: Python :: 3.9', 'Programming Language :: Python :: 3.10', 'Programming Language :: Python :: 3.11', 'License :: OSI Approved :: MIT License']
zip_safe = False
packages = list
package_data = {'pytyped': ['py.typed']}
python_requires = >=3.7
install_requires = ['requests>=2.18.4', 'six>=1.11.0', 'typing-extensions>=4.0.1']
extras_require = {'aio': ['aiohttp>=3.0']}

Which is not that bad for 10 minutes of hacking around

This is a really excellent starting point @lmazuel . Thank you!