> Aha: Introduced in Py 2.2:http://hg.python.org/cpython/rev/20551
> (release ov Py 2.2 is rev/22671.

Sorry, did not read this thoroughly before. I see that the __delitem__
method was also modified there, so the automatic call fo "unsetenv" is
in place already in 2.2.

So, yes you are right.

os.environ[name]=""
del os.environ[name]

should do the job. However, on platforms with "unsetenv" there will be
an extra unnecessary call to "putenv" from the first line.

/Martin

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