[issue1181] Redefine clear() for os.environ to use unsetenv() if possible

[Raghuram Devarakonda]

Raghuram Devarakonda added the comment:

Shouldn't the first clear() in the patch say "del
self.data[key.upper()]" instead of "del self.data[key]"? I also think
the patch should include doc change.

__________________________________
Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1181>
__________________________________