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

[Ned Deily]

Ned Deily added the comment:

According to the Open Group Base Specification (Issue 7 2013 Issue): 

"The setenv() function shall fail if:

[EINVAL]
The envname argument points to an empty string or points to a string containing an '=' character."

So it seems to me that the issue here is that os.environ[''] attempts to allow you to create a environment variable with a null key.

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nosy: +ned.deily
stage:  -> test needed
type: crash -> 
versions: +Python 3.4

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