diff -r 416cd57d38cf Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py	Sun Jul 15 00:38:43 2012 +1000
+++ b/Lib/idlelib/PyShell.py	Wed Jul 18 16:54:06 2012 -0500
@@ -247,8 +247,8 @@
     def ranges_to_linenumbers(self, ranges):
         lines = []
         for index in range(0, len(ranges), 2):
-            lineno = int(float(ranges[index]))
-            end = int(float(ranges[index+1]))
+            lineno = int(float(ranges[index].string))
+            end = int(float(ranges[index+1].string))
             while lineno < end:
                 lines.append(lineno)
                 lineno += 1