Merged revisions 72167 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r72167 | walter.doerwald | 2009-05-01 19:35:37 +0200 (Fr, 01 Mai 2009) | 5 lines

  Make test.test_support.EnvironmentVarGuard behave like a dictionary.

  All changes are mirrored to the underlying os.environ dict, but rolled back
  on exit from the with block.
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diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
index 11674a6..69b2e6c 100644
--- a/Lib/test/test_tempfile.py
+++ b/Lib/test/test_tempfile.py
@@ -153,7 +153,7 @@
             for envname in 'TMPDIR', 'TEMP', 'TMP':
                 dirname = os.getenv(envname)
                 if not dirname:
-                    env.set(envname, os.path.abspath(envname))
+                    env[envname] = os.path.abspath(envname)
 
             cand = tempfile._candidate_tempdir_list()