Fixed #12164 -- Removed the Python 2.3 compatibility imports and workarounds. Thanks to timo and claudep for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13094 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management/base.py

@@ -13,11 +13,6 @@ from django.core.exceptions import ImproperlyConfigured
 from django.core.management.color import color_style
 from django.utils.encoding import smart_str
 
-try:
-    set
-except NameError:
-    from sets import Set as set     # For Python 2.3
-
 class CommandError(Exception):
     """
     Exception class indicating a problem while executing a management