Delete a few unused names suggested by pyflakes.
diff --git a/Lib/idlelib/ClassBrowser.py b/Lib/idlelib/ClassBrowser.py
index 6183be9..a0e782e 100644
--- a/Lib/idlelib/ClassBrowser.py
+++ b/Lib/idlelib/ClassBrowser.py
@@ -101,7 +101,7 @@
             return []
         try:
             dict = pyclbr.readmodule_ex(name, [dir] + sys.path)
-        except ImportError, msg:
+        except ImportError:
             return []
         items = []
         self.classes = {}