Delegates: Difference between revisions

Content added Content deleted

Inline

@@ Line 82: / Line 82: @@
 <pre>
 class Delegator:
-    def __init__(self, delegate=None):
+    def __init__(self):
-        self.delegate = delegate
+        self.delegate = None
-    def thing(self):
+    def operation(self):
          if hasattr(self.delegate, 'thing'):
              return self.delegate.thing()
-         return 42
+         return 'default implementation'
-    def other(self):
-         if hasattr(self.delegate, 'other'):
-             return self.delegate.thing()
-         return 5
 class Delegate:
     def thing(self):
-        return 37
+        return 'delegate implementation'
 if __name__ == '__main__':
@@ Line 101: / Line 97: @@
     # No delegate
     a = Delegator()
-    assert a.thing() == 42
+    assert a.operation() == 'default implementation'
-    assert a.other() == 5
     # With delegate
     a.delegate = Delegate()
-    assert a.thing() == 37
+    assert a.operation() == 'delegate implementation'
-    assert a.other() == 5
 </pre>