maxint->maxsize.  Wouldn't import.
diff --git a/Lib/idlelib/CodeContext.py b/Lib/idlelib/CodeContext.py
index edeb099..3ab6e47 100644
--- a/Lib/idlelib/CodeContext.py
+++ b/Lib/idlelib/CodeContext.py
@@ -12,7 +12,7 @@
 import Tkinter
 from Tkconstants import TOP, LEFT, X, W, SUNKEN
 import re
-from sys import maxint as INFINITY
+from sys import maxsize as INFINITY
 from idlelib.configHandler import idleConf
 
 BLOCKOPENERS = set(["class", "def", "elif", "else", "except", "finally", "for",