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Broken with current setuptools version?

See original GitHub issue

I installed pyroma using pipx for Python 3.9 and then tried to use it on zopefoundation/BTrees:

$ pipx install pyroma
$ cd BTrees
$ pyroma .
------------------------------
Checking .
/.../python3.9/site-packages/_distutils_hack/__init__.py:17: UserWarning: Distutils was imported before Setuptools, but importing Setuptools also replaces the `distutils` module in `sys.modules`. This may lead to undesirable behaviors or errors. To avoid these issues, avoid using distutils directly, ensure that setuptools is installed in the traditional way (e.g. not an editable install), and/or make sure that setuptools is always imported before distutils.
  warnings.warn(
/.../python3.9/site-packages/_distutils_hack/__init__.py:30: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
/.../python3.9/site-packages/setuptools/installer.py:27: SetuptoolsDeprecationWarning: setuptools.installer is deprecated. Requirements should be satisfied by a PEP 517 installer.
  warnings.warn(
invalid command name '.'
$ echo $?
1

Trying to use a package name from PyPI leads to:

$ pyroma BTrees
------------------------------
Checking BTrees
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /pypi/BTrees/json HTTP/1.1" 200 109675
Found BTrees version 4.10.0
Downloading BTrees-4.10.0.tar.gz to verify distribution
Starting new HTTPS connection (1): files.pythonhosted.org:443
https://files.pythonhosted.org:443 "GET /packages/7b/a5/38cb37e0afae6b00392062b78364033354a34c1f73c879e5eeaabf57f709/BTrees-4.10.0.tar.gz HTTP/1.1" 200 195139
/.../python3.9/site-packages/_distutils_hack/__init__.py:17: UserWarning: Distutils was imported before Setuptools, but importing Setuptools also replaces the `distutils` module in `sys.modules`. This may lead to undesirable behaviors or errors. To avoid these issues, avoid using distutils directly, ensure that setuptools is installed in the traditional way (e.g. not an editable install), and/or make sure that setuptools is always imported before distutils.
  warnings.warn(
/.../python3.9/site-packages/_distutils_hack/__init__.py:30: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
/.../python3.9/site-packages/setuptools/installer.py:27: SetuptoolsDeprecationWarning: setuptools.installer is deprecated. Requirements should be satisfied by a PEP 517 installer.
  warnings.warn(
usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
   or: setup.py --help [cmd1 cmd2 ...]
   or: setup.py --help-commands
   or: setup.py cmd --help

error: invalid command 'BTrees'
$ echo $?
1

Installed packages in the venv:

$ bin/python -m pip freeze --all
certifi==2021.10.8
charset-normalizer==2.0.12
docutils==0.18.1
idna==3.3
pip==22.0.4
Pygments==2.11.2
pyroma==3.2
requests==2.27.1
setuptools==60.9.3
urllib3==1.26.8
wheel==0.37.1