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The patch looks basically right. A few minor issues:
* "message=None," should probably be "message,", that is, message should not be allowed to default to None - I can't see any use case for this action without a message. I believe this means the body of __call__ can be simplified to::
 self.file.write(self.message)
 self.file.write("\n")
 parser.exit()
* The other thing the patch needs is to update the test suite to add tests to make sure this behavior works. Take a look at test_argparse.py for how to do that.
* The last thing is that to have the greatest chance of having someone check this in, you'll want to make your patch against Python trunk as explained here:
http://www.python.org/dev/faq/#how-do-i-get-a-checkout-of-the-repository-read-only-or-read-write
http://www.python.org/dev/faq/#how-to-make-a-patch
Thanks!