Use the new unicode literals for the io module
use basestring instead of str in Python 2.x
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 1791705..e26b708 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1,5 +1,6 @@
 """Unit tests for io.py."""
 from __future__ import print_function
+from __future__ import unicode_literals
 
 import os
 import sys