Merged revisions 71992 via svnmerge from

Merged revisions 71992 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r71992 | walter.doerwald | 2009-04-26 23:39:21 +0200 (So, 26 Apr 2009) | 9 lines

  Merged revisions 71984 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r71984 | walter.doerwald | 2009-04-26 22:51:44 +0200 (So, 26 Apr 2009) | 2 lines

    Use test.test_support.EnvironmentVarGuard where tests change environment vars.
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