`seqeval` build is broken on `setuptools<61` (Python 3.8)

[jgerityneurala]

How to reproduce the problem

I noticed this problem while running pip-compile to resolve a dependency graph that includes seqeval, shortly after the 21 Feb 2025 release of setuptools-scm 8.2

Attempt to install seqeval==1.2.2 into a Python environment with setuptools<61, such as a fresh Python 3.8 virtual environment (which will have setuptools 56.0).

$ python3 -V
3.8.14
$ python3 -m venv repro_venv
$ ./repro_venv/bin/python3 -m pip show setuptools | grep Version
Version: 56.0.0
$ ./repro_venv/bin/python3 -m pip install --no-cache seqeval==1.2.2

$ ./repro_venv/bin/python3 -m pip install --no-cache seqeval==1.2.2
Collecting seqeval==1.2.2
  Downloading seqeval-1.2.2.tar.gz (43 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 43.6/43.6 KB 5.4 MB/s eta 0:00:00
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [73 lines of output]
      WARNING: The wheel package is not available.
      WARNING: The wheel package is not available.
      WARNING: The wheel package is not available.
      WARNING: The wheel package is not available.
      WARNING: The wheel package is not available.
      /tmp/pip-install-u8qnlzk2/seqeval_421dc18d836d45ed8b8fc176526d3cf6/.eggs/setuptools_scm-8.2.0-py3.8.egg/setuptools_scm/_integration/setuptools.py:31: RuntimeWarning:
      ERROR: setuptools==56.0.0 is used in combination with setuptools-scm>=8.x

      Your build configuration is incomplete and previously worked by accident!
      setuptools-scm requires setuptools>=61

      Suggested workaround if applicable:
       - migrating from the deprecated setup_requires mechanism to pep517/518
         and using a pyproject.toml to declare build dependencies
         which are reliably pre-installed before running the build tools

        warnings.warn(
      WARNING setuptools_scm.pyproject_reading toml section missing 'pyproject.toml does not contain a tool.setuptools_scm section'
      Traceback (most recent call last):
        File "/tmp/pip-install-u8qnlzk2/seqeval_421dc18d836d45ed8b8fc176526d3cf6/.eggs/setuptools_scm-8.2.0-py3.8.egg/setuptools_scm/_integration/pyproject_reading.py", line 36, in read_pyproject
          section = defn.get("tool", {})[tool_name]
      KeyError: 'setuptools_scm'
      running egg_info
      creating /tmp/pip-pip-egg-info-fx_p_ap7/seqeval.egg-info
      writing /tmp/pip-pip-egg-info-fx_p_ap7/seqeval.egg-info/PKG-INFO
      writing dependency_links to /tmp/pip-pip-egg-info-fx_p_ap7/seqeval.egg-info/dependency_links.txt
      writing requirements to /tmp/pip-pip-egg-info-fx_p_ap7/seqeval.egg-info/requires.txt
      writing top-level names to /tmp/pip-pip-egg-info-fx_p_ap7/seqeval.egg-info/top_level.txt
      writing manifest file '/tmp/pip-pip-egg-info-fx_p_ap7/seqeval.egg-info/SOURCES.txt'
      Traceback (most recent call last):
...

Note these lines in particular:

      ERROR: setuptools==56.0.0 is used in combination with setuptools-scm>=8.x

      Your build configuration is incomplete and previously worked by accident!
      setuptools-scm requires setuptools>=61

The most straightforward fix to the issue is to add a pyproject.toml declaring setuptools as the build backend, and build isolation will ensure that the building venv ends up with a newer copy of setuptools.

Your Environment

• Operating System: Ubuntu 22.04
• Python Version: Python 3.8
• Package Version: 1.2.2

[rikigigi]

Also my build in python 3.10 is broken

 Downloading seqeval-1.2.2.tar.gz (43 kB)
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'error'
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [68 lines of output]
      /tmp/pip-install-n73vn3kq/seqeval_3faf562572744cbf8a6d531e19c15ecd/.eggs/setuptools_scm-8.2.0-py3.10.egg/setuptools_scm/_integration/setuptools.py:31: RuntimeWarning:
      ERROR: setuptools==58.1.0 is used in combination with setuptools-scm>=8.x
      
      Your build configuration is incomplete and previously worked by accident!
      setuptools-scm requires setuptools>=61
      
      Suggested workaround if applicable:
       - migrating from the deprecated setup_requires mechanism to pep517/518
         and using a pyproject.toml to declare build dependencies
         which are reliably pre-installed before running the build tools
      
        warnings.warn(
      WARNING setuptools_scm.pyproject_reading toml section missing 'pyproject.toml does not contain a tool.setuptools_scm section'
      Traceback (most recent call last):
        File "/tmp/pip-install-n73vn3kq/seqeval_3faf562572744cbf8a6d531e19c15ecd/.eggs/setuptools_scm-8.2.0-py3.10.egg/setuptools_scm/_integration/pyproject_reading.py", line 36, in read_pyproject
          section = defn.get("tool", {})[tool_name]
      KeyError: 'setuptools_scm'
      running egg_info
      creating /tmp/pip-pip-egg-info-lablpjh5/seqeval.egg-info
      writing /tmp/pip-pip-egg-info-lablpjh5/seqeval.egg-info/PKG-INFO
      writing dependency_links to /tmp/pip-pip-egg-info-lablpjh5/seqeval.egg-info/dependency_links.txt
      writing requirements to /tmp/pip-pip-egg-info-lablpjh5/seqeval.egg-info/requires.txt
      writing top-level names to /tmp/pip-pip-egg-info-lablpjh5/seqeval.egg-info/top_level.txt
      writing manifest file '/tmp/pip-pip-egg-info-lablpjh5/seqeval.egg-info/SOURCES.txt'
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-n73vn3kq/seqeval_3faf562572744cbf8a6d531e19c15ecd/setup.py", line 27, in <module>
          setup(
        File "/usr/local/lib/python3.10/site-packages/setuptools/__init__.py", line 153, in setup
          return distutils.core.setup(**attrs)
        File "/usr/local/lib/python3.10/distutils/core.py", line 148, in setup
          dist.run_commands()
        File "/usr/local/lib/python3.10/distutils/dist.py", line 966, in run_commands
          self.run_command(cmd)
        File "/usr/local/lib/python3.10/distutils/dist.py", line 985, in run_command
          cmd_obj.run()
        File "/usr/local/lib/python3.10/site-packages/setuptools/command/egg_info.py", line 299, in run
          self.find_sources()
        File "/usr/local/lib/python3.10/site-packages/setuptools/command/egg_info.py", line 306, in find_sources
          mm.run()
        File "/usr/local/lib/python3.10/site-packages/setuptools/command/egg_info.py", line 541, in run
          self.add_defaults()
        File "/usr/local/lib/python3.10/site-packages/setuptools/command/egg_info.py", line 578, in add_defaults
          sdist.add_defaults(self)
        File "/usr/local/lib/python3.10/distutils/command/sdist.py", line 226, in add_defaults
          self._add_defaults_python()
        File "/usr/local/lib/python3.10/site-packages/setuptools/command/sdist.py", line 107, in _add_defaults_python
          build_py = self.get_finalized_command('build_py')
        File "/usr/local/lib/python3.10/distutils/cmd.py", line 299, in get_finalized_command
          cmd_obj.ensure_finalized()
        File "/usr/local/lib/python3.10/distutils/cmd.py", line 107, in ensure_finalized
          self.finalize_options()
        File "/usr/local/lib/python3.10/site-packages/setuptools/command/build_py.py", line 29, in finalize_options
          orig.build_py.finalize_options(self)
        File "/usr/local/lib/python3.10/distutils/command/build_py.py", line 43, in finalize_options
          self.set_undefined_options('build',
        File "/usr/local/lib/python3.10/distutils/cmd.py", line 286, in set_undefined_options
          src_cmd_obj = self.distribution.get_command_obj(src_cmd)
        File "/usr/local/lib/python3.10/distutils/dist.py", line 857, in get_command_obj
          klass = self.get_command_class(command)
        File "/usr/local/lib/python3.10/site-packages/setuptools/dist.py", line 887, in get_command_class
          self.cmdclass[command] = cmdclass = ep.load()
        File "/usr/local/lib/python3.10/site-packages/pkg_resources/__init__.py", line 2450, in load
          return self.resolve()
        File "/usr/local/lib/python3.10/site-packages/pkg_resources/__init__.py", line 2456, in resolve
          module = __import__(self.module_name, fromlist=['__name__'], level=0)
      ModuleNotFoundError: No module named 'setuptools.command.build'
      [end of output]

[jgerityneurala]

@rikigigi that looks like the same issue, if you can upgrade your setuptools (or possibly downgrade your setuptools-scm requirement) in the installing environment, it will probably resolve the build failure.