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Your doc is wrong: getpreferredencoding() isn't hardcoded to UTF-8 on VxWorks.

You have to hack Lib/_bootlocale.py and Lib/locale.py using sys.platform == "vxworks" to make this effective.

I guess that you can just replace if hasattr(sys, 'getandroidapilevel'): with if hasattr(sys, 'getandroidapilevel') and sys.platform == "vxworks":, and update the related comments.

On VxWorks, always return "UTF-8" with sys.flags.utf8_mode is True in both locale.py&_bootlocale.py:
if sys.flags.utf8_mode:
return 'UTF-8'
So it does't need to add judgement with sys.platform == "vxworks".

I have made the requested changes; please review again.

Thanks for making the requested changes!

@vstinner: please review the changes made to this pull request.

The author of this PR has quit the job. A new PR #19448 was created to replace this one. Please anyone helps to close this PR.

@pxinwr Thank you for letting me know