[issue20658] os.environ.clear() fails with empty keys (posix.unsetenv)

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

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

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<https://bugs.python.org/issue20658>
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