setup.py

from pkg_resources import parse_version
from configparser import ConfigParser
import setuptools

assert parse_version(setuptools.__version__) >= parse_version("36.2")

# note: all settings are in settings.ini; edit there, not here
config = ConfigParser(delimiters=["="])
config.read("settings.ini")
cfg = config["DEFAULT"]

cfg_keys = "version description keywords author author_email".split()
expected = (
    cfg_keys
    + "lib_name user branch license status min_python audience language".split()
)
for o in expected:
    assert o in cfg, "missing expected setting: {}".format(o)
setup_cfg = {o: cfg[o] for o in cfg_keys}

licenses = {
    "apache2": (
        "Apache Software License 2.0",
        "OSI Approved :: Apache Software License",
    ),
    "mit": ("MIT License", "OSI Approved :: MIT License"),
    "gpl2": (
        "GNU General Public License v2",
        "OSI Approved :: GNU General Public License v2 (GPLv2)",
    ),
    "gpl3": (
        "GNU General Public License v3",
        "OSI Approved :: GNU General Public License v3 (GPLv3)",
    ),
    "bsd3": ("BSD License", "OSI Approved :: BSD License"),
    "agpl3": (
        "GNU Affero General Public License v3",
        "OSI Approved :: GNU Affero General Public License v3 (AGPLv3)",
    ),
}
statuses = [
    "1 - Planning",
    "2 - Pre-Alpha",
    "3 - Alpha",
    "4 - Beta",
    "5 - Production/Stable",
    "6 - Mature",
    "7 - Inactive",
]
py_versions = "2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10".split()

with open("requirements.txt") as f:
    requirements = [l.strip() for l in f.readlines()]
min_python = cfg["min_python"]
lic = licenses.get(cfg["license"].lower(), (cfg["license"], None))

setuptools.setup(
    name=cfg["lib_name"],
    license=lic[0],
    classifiers=[
        "Development Status :: " + statuses[int(cfg["status"])],
        "Intended Audience :: " + cfg["audience"].title(),
        "Natural Language :: " + cfg["language"].title(),
    ]
    + [
        "Programming Language :: Python :: " + o
        for o in py_versions[py_versions.index(min_python) :]
    ]
    + (["License :: " + lic[1]] if lic[1] else []),
    url=cfg["git_url"],
    packages=setuptools.find_packages(),
    include_package_data=True,
    install_requires=requirements,
    dependency_links=cfg.get("dep_links", "").split(),
    python_requires=">=" + cfg["min_python"],
    long_description=open("README.md").read(),
    long_description_content_type="text/markdown",
    zip_safe=False,
    entry_points={"console_scripts": cfg.get("console_scripts", "").split()},
    **setup_cfg
)