def get_banner(self):
return (None, None)<EOL>
A pre-login banner to display to the user. The message may span
multiple lines separated by crlf pairs. The language should be in
rfc3066 style, for example: en-US

The default implementation always returns ``(None, None)``.

:returns: A tuple containing the banner and language code.

.. versionadded:: 2.3