py23 import in all nontrivial source files and unused import cleanup
diff --git a/Lib/fontTools/ttLib/tables/otBase.py b/Lib/fontTools/ttLib/tables/otBase.py
index a2a1077..ef81ed1 100644
--- a/Lib/fontTools/ttLib/tables/otBase.py
+++ b/Lib/fontTools/ttLib/tables/otBase.py
@@ -1,6 +1,6 @@
 from .DefaultTable import DefaultTable
-from . import otData
 import struct
+from fontTools.misc.py23 import *
 
 class OverflowErrorRecord:
 	def __init__(self, overflowTuple):