diff -r fb9d4ccbadf0 -r f7db966c9fee Lib/test/test_calendar.py
--- a/Lib/test/test_calendar.py	Sun Nov 01 01:02:39 2015 -0700
+++ b/Lib/test/test_calendar.py	Sun Nov 01 00:55:31 2015 +0300
@@ -479,20 +479,17 @@
         # (it is still not thread-safe though)
         old_october = calendar.TextCalendar().formatmonthname(2010, 10, 10)
         try:
-            cal = calendar.LocaleTextCalendar(locale=None)
+            cal = calendar.LocaleTextCalendar(locale='')
             local_weekday = cal.formatweekday(1, 10)
-            local_weekday_abbr = cal.formatweekday(1, 3)
             local_month = cal.formatmonthname(2010, 10, 10)
         except locale.Error:
             # cannot set the system default locale -- skip rest of test
             raise unittest.SkipTest('cannot set the system default locale')
         self.assertIsInstance(local_weekday, str)
-        self.assertIsInstance(local_weekday_abbr, str)
         self.assertIsInstance(local_month, str)
         self.assertEqual(len(local_weekday), 10)
-        self.assertEqual(len(local_weekday_abbr), 3)
         self.assertGreaterEqual(len(local_month), 10)
-        cal = calendar.LocaleHTMLCalendar(locale=None)
+        cal = calendar.LocaleHTMLCalendar(locale='')
         local_weekday = cal.formatweekday(1)
         local_month = cal.formatmonthname(2010, 10)
         self.assertIsInstance(local_weekday, str)