ModuleNotFoundError: No module named 'pkg_resources' — setuptools 82 (Feb 2026) removed pkg_resources

Port the code (long-term):

# before
from pkg_resources import parse_version, get_distribution, resource_filename, iter_entry_points
v = get_distribution("requests").version
path = resource_filename("mypkg", "data/x.json")
for ep in iter_entry_points("mypkg.plugins"): ep.load()

# after
from packaging.version import parse as parse_version      # add `packaging` to deps/build-system.requires
from importlib.metadata import version, entry_points
from importlib.resources import files
v = version("requests")
path = files("mypkg") / "data/x.json"
for ep in entry_points(group="mypkg.plugins"): ep.load()

For a third-party package, upgrade it first. Stop-gap:

pip install "setuptools<82"                 # runtime import
echo 'setuptools<82' > build-pins.txt
pip install --build-constraint build-pins.txt pkg   # sdist build (pip >= 25.3)
# uv: uv add "setuptools<82"   or   uv pip install "setuptools<82"