Github action using windows-latest causes 'answer' to be None causing a TypeError

[aroberge]

I have not been able to reproduce the following error locally: only when using tox as part of a github action. Everything works on ubuntu-latest and macos-latest, but fails with windows-latest. As it might not be reproducible locally, feel free to close this issue if you deem it appropriate.

The github action configuration file is https://github.com/aroberge/friendly/blob/master/.github/workflows/tests.yml

A typical traceback generated is as follows:

 File "c:\hostedtoolcache\windows\python\3.9.5\x64\lib\site-packages\tox\session\__init__.py", line 44, in cmdline
    main(args)
  File "c:\hostedtoolcache\windows\python\3.9.5\x64\lib\site-packages\tox\session\__init__.py", line 69, in main
    exit_code = session.runcommand()
ERROR: invocation failed (exit code 1), logfile: D:\a\friendly\friendly\.tox\py36\log\py36-5.log
  File "c:\hostedtoolcache\windows\python\3.9.5\x64\lib\site-packages\tox\session\__init__.py", line 197, in runcommand
    return self.subcommand_test()
  File "c:\hostedtoolcache\windows\python\3.9.5\x64\lib\site-packages\tox\session\__init__.py", line 225, in subcommand_test
    run_sequential(self.config, self.venv_dict)
  File "c:\hostedtoolcache\windows\python\3.9.5\x64\lib\site-packages\tox\session\commands\run\sequential.py", line 9, in run_sequential
    if venv.setupenv():
  File "c:\hostedtoolcache\windows\python\3.9.5\x64\lib\site-packages\tox\venv.py", line 656, in setupenv
    envlog.set_python_info(command_path)
  File "c:\hostedtoolcache\windows\python\3.9.5\x64\lib\site-packages\tox\logs\env.py", line 18, in set_python_info
    answer["executable"] = python_executable
TypeError: 'NoneType' object does not support item assignment

[aroberge]

This issue appears to have been caused by the presence of a separate .coveragerc file while having a [coverage:run] section also in tox.ini. Removing that section has gotten rid of the problem.

[aroberge]

If anyone is reading this: the error reappeared. Github actions seem to be flakey.

[BeyondEvil]

I have it too. No idea why https://github.com/pytest-dev/pytest-selenium/runs/5720309620?check_suite_focus=true