Question: When I try to install from a .tar.gz package, while making warnings into errors: python -W error -m pip install /some/path/nspace.pkga-0.1.0.tar.gz  I get this error: ERROR: Exception: Traceback (most recent call last): File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/cli/base_command.py", line 169, in exc_logging_wrapper status = run_func(*args) ^^^^^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/cli/req_command.py", line 248, in wrapper return func(self, options, args) ^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/commands/install.py", line 324, in run session = self.get_default_session(options) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/cli/req_command.py", line 98, in get_default_session self._session = self.enter_context(self._build_session(options)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/cli/req_command.py", line 125, in _build_session session = PipSession( ^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/network/session.py", line 342, in __init__ self.headers["User-Agent"] = user_agent() ^^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/network/session.py", line 175, in user_agent setuptools_dist = get_default_environment().get_distribution("setuptools") ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/metadata/importlib/_envs.py", line 188, in get_distribution return next(matches, None) ^^^^^^^^^^^^^^^^^^^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/metadata/importlib/_envs.py", line 183, in <genexpr> matches = ( ^ File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/metadata/base.py", line 612, in iter_all_distributions for dist in self._iter_distributions(): File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/metadata/importlib/_envs.py", line 176, in _iter_distributions for dist in finder.find_eggs(location): File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/metadata/importlib/_envs.py", line 144, in find_eggs yield from self._find_eggs_in_dir(location) File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_internal/metadata/importlib/_envs.py", line 111, in _find_eggs_in_dir from pip._vendor.pkg_resources import find_distributions File "/opt/util/nspace1/lib/python3.11/site-packages/pip/_vendor/pkg_resources/__init__.py", line 121, in <module> warnings.warn("pkg_resources is deprecated as an API", DeprecationWarning) DeprecationWarning: pkg_resources is deprecated as an API  pip seems to have vendored in a deprecated package. The pip code responsible is in pip/_internal/metadata/importlib/_envs.py in class Environment:  def _iter_distributions(self) -> Iterator[BaseDistribution]: finder = _DistributionFinder() for location in self._paths: yield from finder.find(location) for dist in finder.find_eggs(location): # _emit_egg_deprecation(dist.location) # TODO: Enable this. yield dist # This must go last because that's how pkg_resources tie-breaks. yield from finder.find_linked(location)  If I comment out the nested for loop (doing the find_eggs) thinks work fine: I get no error and a working package installed. How do I monkeypatch that Environment instance from my setup.py file? This is Python 3.11.3 (so it should be using importlib.metadata and not pkg_resources) on macOS, pip==23.1, setuptools==67.6.1 Background: I am just trying this out on an example package, the reason for this is based on a bug report for my ruamel.yaml package, where it is build in such a less forgiving environment. I could of course say don't use -W error, but I rather solve this, by not invoking the offending, unused code in the first place

Answer: There is a related discussion on pip's ticket tracker. It seems like this issue has been solved in pip 23.1.1: "Revert pkg_resources (via setuptools) back to 65.6.3". And pip 23.1.2 seems to vendor the new setuptools (and pkg_resources) as expected but without the deprecation warnings (see also this message).