Fixed #7718 -- Added a naive implementation of sorted() for Python 2.3 compatibility, and modified test cases to import the function when required.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7914 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/basic/models.py

@@ -4,12 +4,18 @@
 
 This is a basic model with only two non-primary-key fields.
 """
-
+# Python 2.3 doesn't have set as a builtin
 try:
     set
 except NameError:
     from sets import Set as set
 
+# Python 2.3 doesn't have sorted()
+try:
+    sorted
+except NameError:
+    from django.utils.itercompat import sorted
+
 from django.db import models
 
 class Article(models.Model):