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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def extensionResponse(self, namespace_uri, require_signed):
 """Return response arguments in the specified namespace. @param namespace_uri: The namespace URI of the arguments to be returned. @param require_signed: True if the arguments should be among those signed in the response, False if you don't care. If require_signed is True and the arguments are not signed, return None. """

        if require_signed:
            return self.getSignedNS(namespace_uri)
        else:
            return self.message.getArgs(namespace_uri)