Eryk Sun <eryk...@gmail.com> added the comment:

This bypasses the CRT's copy of the environment. If any C code calls 
[_w]getenv, it will still see the variable defined. The only way it won't is if 
setting the value also bypassed the CRT environment by directly calling 
SetEnvironmentVariableW.

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nosy: +eryksun

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39413>
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