Catalan numbers: Difference between revisions

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@@ Line 1,603: / Line 1,603: @@
     def memoized(key):
         # Returned, new, memoized version of decorated function
-        if key in cache:
+        if key not in cache:
-            return cache[key]
+            cache[key] = func(key)
-        else:
+        return cache[key]
-            cache[key] = result = func(key)
-            return result
     return functools.update_wrapper(memoized, func)