Walter Dörwald <wal...@livinglogic.de> added the comment:

Hmm, EnvironmentVarGuard seems to be broken:

import os
from test import support

with support.EnvironmentVarGuard() as env:
   env.unset("HOME")
   env.set("HOME", "bar")

print(os.environ.get("HOME"))

I would have expected that to print the original HOME variable. I'm
going to open a new bug report for that.

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<http://bugs.python.org/issue4951>
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