Fixed #17634 -- Optimized the performance of MultiValueDict by using append instead of copy and by minimizing the number of dict lookups. Refs #736.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17464 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/utils/datastructures.py

@@ -206,6 +206,12 @@ class MultiValueDictTests(SimpleTestCase):
         self.assertEqual(list(d.itervalues()),
                           ['Developer', 'Simon', 'Willison'])
 
+    def test_appendlist(self):
+        d = MultiValueDict()
+        d.appendlist('name', 'Adrian')
+        d.appendlist('name', 'Simon')
+        self.assertEqual(d.getlist('name'), ['Adrian', 'Simon'])
+
     def test_copy(self):
         for copy_func in [copy.copy, lambda d: d.copy()]:
             d1 = MultiValueDict({