Deprecate BaseException.message as per PEP 352.

Lib/ConfigParser.py

@@ -106,6 +106,21 @@ MAX_INTERPOLATION_DEPTH = 10
 class Error(Exception):
     """Base class for ConfigParser exceptions."""
 
+    def _get_message(self):
+        """Getter for 'message'; needed only to override deprecation in
+        BaseException."""
+        return self.__message
+
+    def _set_message(self, value):
+        """Setter for 'message'; needed only to override deprecation in
+        BaseException."""
+        self.__message = value
+
+    # BaseException.message has been deprecated since Python 2.6.  To prevent
+    # DeprecationWarning from popping up over this pre-existing attribute, use
+    # a new property that takes lookup precedence.
+    message = property(_get_message, _set_message)
+
     def __init__(self, msg=''):
         self.message = msg
         Exception.__init__(self, msg)