STINNER Victor <vstin...@python.org> added the comment:
I checked the doc: _putenv("VAR=") removes the environment variable "VAR". It's
well documented:
https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/putenv-wputenv?view=vs-2019
"You can remove a variable from the environment by specifying an empty
value_string, or in other words, by specifying only varname=."
So Python 3.8 os._unsetenv() is correct, but this function was not exposed, and
so this issue remains relevant: Python 3.8 documents that os.unsetenv() is
available on Windows, but it's not.
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<https://bugs.python.org/issue39413>
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