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/regressiontests/model_inheritance_regress/models.py

@@ -6,6 +6,12 @@ import datetime
 
 from django.db import models
 
+# Python 2.3 doesn't have sorted()
+try:
+    sorted
+except NameError:
+    from django.utils.itercompat import sorted
+
 class Place(models.Model):
     name = models.CharField(max_length=50)
     address = models.CharField(max_length=80)