py23 import in all nontrivial source files and unused import cleanup
diff --git a/Lib/fontTools/ttLib/tables/ttProgram.py b/Lib/fontTools/ttLib/tables/ttProgram.py
index 51c7794..6186189 100644
--- a/Lib/fontTools/ttLib/tables/ttProgram.py
+++ b/Lib/fontTools/ttLib/tables/ttProgram.py
@@ -3,6 +3,7 @@
import array
import re
from fontTools.misc.textTools import num2binary, binary2num, readHex
+from fontTools.misc.py23 import *
# first, the list of instructions that eat bytes or words from the instruction stream