Replace backticks with repr() or "%r"

From SF patch #852334.
diff --git a/Lib/test/test_univnewlines.py b/Lib/test/test_univnewlines.py
index a6c079b..e91bde7 100644
--- a/Lib/test/test_univnewlines.py
+++ b/Lib/test/test_univnewlines.py
@@ -51,13 +51,13 @@
         fp = open(test_support.TESTFN, self.READMODE)
         data = fp.read()
         self.assertEqual(data, DATA_LF)
-        self.assertEqual(`fp.newlines`, `self.NEWLINE`)
+        self.assertEqual(repr(fp.newlines), repr(self.NEWLINE))
 
     def test_readlines(self):
         fp = open(test_support.TESTFN, self.READMODE)
         data = fp.readlines()
         self.assertEqual(data, DATA_SPLIT)
-        self.assertEqual(`fp.newlines`, `self.NEWLINE`)
+        self.assertEqual(repr(fp.newlines), repr(self.NEWLINE))
 
     def test_readline(self):
         fp = open(test_support.TESTFN, self.READMODE)
@@ -67,7 +67,7 @@
             data.append(d)
             d = fp.readline()
         self.assertEqual(data, DATA_SPLIT)
-        self.assertEqual(`fp.newlines`, `self.NEWLINE`)
+        self.assertEqual(repr(fp.newlines), repr(self.NEWLINE))
 
     def test_seek(self):
         fp = open(test_support.TESTFN, self.READMODE)