python argparse - deprecating options

parser.py

+class ActionStoreDeprecated(argparse.Action):
+    def __call__(self, parser, namespace, values, option_string=None):
+        logger.warn('DEPRECATED: using %s', '|'.join(self.option_strings))
+        setattr(namespace, self.dest, values)
+
+
+class ActionAppendDeprecated(argparse.Action):
+    def __call__(self, parser, namespace, values, option_string=None):
+        logger.warn('DEPRECATED: using %s', '|'.join(self.option_strings))
+        if not getattr(namespace, self.dest):
+            setattr(namespace, self.dest, [])
+        getattr(namespace, self.dest).append(values)

 parser = argparse.ArgumentParser()
  
 parser.add_argument(
        '-f',
        '--foo',
        help='DEPRECATED: has no effect',
        action=ActionStoreDeprecated
    )