py23 import in all nontrivial source files and unused import cleanup
diff --git a/Lib/fontTools/ttLib/tables/DefaultTable.py b/Lib/fontTools/ttLib/tables/DefaultTable.py
index 5202f6a..45606e1 100644
--- a/Lib/fontTools/ttLib/tables/DefaultTable.py
+++ b/Lib/fontTools/ttLib/tables/DefaultTable.py
@@ -1,4 +1,4 @@
-import sys
+from fontTools.misc.py23 import *
 
 class DefaultTable: