Fixed #8228: fixed a Python 2.3 compatibility from [8296].

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8303 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/__init__.py

@@ -4,6 +4,11 @@ try:
 except ImportError:
     # Import copy of _thread_local.py from Python 2.4
     from django.utils._threading_local import local
+try:
+    set
+except NameError
+    # Python 2.3 compat
+    from sets import Set as set
     
 from django.db.backends import util
 from django.utils import datetime_safe

django/db/backends/creation.py

@@ -1,5 +1,10 @@
 import sys
 import time
+try:
+    set
+except NameError:
+    # Python 2.3 compat
+    from sets import Set as set
 
 from django.conf import settings
 from django.core.management import call_command