Fixed #28064 -- Removed double-quoting of key names in MultiValueDictKeyError.

django/utils/datastructures.py

@@ -76,7 +76,7 @@ class MultiValueDict(dict):
         try:
             list_ = super().__getitem__(key)
         except KeyError:
-            raise MultiValueDictKeyError(repr(key))
+            raise MultiValueDictKeyError(key)
         try:
             return list_[-1]
         except IndexError:

tests/utils_tests/test_datastructures.py

@@ -48,8 +48,9 @@ class MultiValueDictTests(SimpleTestCase):
             [('name', ['Adrian', 'Simon']), ('position', ['Developer'])]
         )
 
-        with self.assertRaisesMessage(MultiValueDictKeyError, 'lastname'):
+        with self.assertRaises(MultiValueDictKeyError) as cm:
             d.__getitem__('lastname')
+        self.assertEqual(str(cm.exception), "'lastname'")
 
         self.assertIsNone(d.get('lastname'))
         self.assertEqual(d.get('lastname', 'nonexistent'), 'nonexistent')