Drop support for Python2.3

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@29096 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Message.py

@@ -38,18 +38,7 @@ try:
 except ImportError:
   from Products.ERP5Type.patches.string import Template
 
-# API of base64 has changed between python v2.3 and v2.4
-import base64
-try:
-  # python v2.4 API
-  b64encode = base64.b64encode
-  b64decode = base64.b64decode
-except AttributeError:
-  # python v2.3 API
-  b64encode = base64.encodestring
-  b64decode = base64.decodestring
-
-
+from base64 import b64encode, b64decode
 
 class Message(Persistent):
   """