we no longer support python-2.3.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39448 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/ListBox.py

@@ -54,12 +54,6 @@ from warnings import warn
 import md5
 import cgi
 
-# For compatibility with Python 2.3.
-try:
-  set
-except NameError:
-  from sets import Set as set
-
 DEFAULT_LISTBOX_DISPLAY_STYLE = 'table'
 
 class MethodWrapper: