Build fails with setuptools 50.0.0

[Ninban]

Using pip 20.2.2 and setuptools 50.0.0 (released yesterday, August 30th)

Downgrading setuptools to 49.6.0 enabled me to workaround the issue.
Output:

Collecting chumpy
  Downloading chumpy-0.70.tar.gz (50 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/work/env/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-n2ix487y/chumpy/setup.py'"'"'; __file__='"'"'/tmp/pip-install-n2ix487y/chumpy/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-gprw26td
         cwd: /tmp/pip-install-n2ix487y/chumpy/
    Complete output (15 lines):
    /home/work/env/lib/python3.6/site-packages/_distutils_hack/__init__.py:30: UserWarning: Setuptools is replacing distutils.
      warnings.warn("Setuptools is replacing distutils.")
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-n2ix487y/chumpy/setup.py", line 56, in <module>
        'Operating System :: POSIX :: Linux'
      File "/home/work/env/lib/python3.6/site-packages/setuptools/_distutils/core.py", line 134, in setup
        ok = dist.parse_command_line()
      File "/home/work/env/lib/python3.6/site-packages/setuptools/_distutils/dist.py", line 484, in parse_command_line
        args = self._parse_command_opts(parser, args)
      File "/home/work/env/lib/python3.6/site-packages/setuptools/dist.py", line 903, in _parse_command_opts
        nargs = _Distribution._parse_command_opts(self, parser, args)
      File "/home/work/env/lib/python3.6/site-packages/setuptools/_distutils/dist.py", line 548, in _parse_command_opts
        "command class %s must subclass Command" % cmd_class)
    distutils.errors.DistutilsClassError: command class <class 'setuptools.command.egg_info.egg_info'> must subclass Command
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

[remmel]

Try to upgrade pip : python -m pip install --upgrade pip

[Ninban]

Thanks, this certainly needs retesting with latest versions of pip/setuptools but I no longer work on the project and environment affected. I'm closing the issue as no longer relevant.