Merged revisions 77727 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r77727 | ezio.melotti | 2010-01-24 18:58:36 +0200 (Sun, 24 Jan 2010) | 1 line

  use assert[Not]IsInstance where appropriate
........
diff --git a/Lib/test/test_urllib2net.py b/Lib/test/test_urllib2net.py
index 59a73c9..70b4cfa 100644
--- a/Lib/test/test_urllib2net.py
+++ b/Lib/test/test_urllib2net.py
@@ -172,7 +172,7 @@
                 if expected_err:
                     msg = ("Didn't get expected error(s) %s for %s %s, got %s: %s" %
                            (expected_err, url, req, type(err), err))
-                    self.assertTrue(isinstance(err, expected_err), msg)
+                    self.assertIsInstance(err, expected_err, msg)
             else:
                 with support.time_out, \
                      support.socket_peer_reset, \