Ticket #4041: 4041.diff

django/core/cache/backends/base.py

@@ -54 +54 @@
         Returns True if the key is in the cache and has not expired.
         """
         return self.get(key) is not None
+
+    def __contains__(self, key):
+        """
+        Allow use of 'in' operator.
+        """
+        return self.has_key(key)

tests/regressiontests/cache/tests.py

@@ -46 +46 @@
         self.assertEqual(cache.has_key("hello"), True)
         self.assertEqual(cache.has_key("goodbye"), False)
 
+    def test_in(self):
+        # has_key
+        cache.set("hello", "goodbye")
+        self.assertEqual("hello" in cache, True)
+        self.assertEqual("goodbye" in cache, False)
+
     def test_data_types(self):
         # test data types
         stuff = {