STINNER Victor <vstin...@python.org> added the comment:

By the way:
---
The env command from GNU coreutils supports setting the environment variable 
with an empty name but not unsetting it. That's a bug.

$ env '=wibble' env |grep wibble                                 
=wibble
$ env '=wibble' env -u '' env
env: cannot unset `': Invalid argument
---

https://unix.stackexchange.com/questions/178522/unsetting-environment-variable-with-an-empty-name

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue20658>
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