def __init__(self, subscription_text=None):
self._subscription_text = None<EOL>if subscription_text is not None:<EOL><INDENT>self.subscription_text = subscription_text<EOL><DEDENT>
Create a SubscriptionText object

        :param subscription_text: Text to be appended to the email, with the
                                  subscription tracking link. You may control
                                  where the link is by using the tag <% %>
        :type subscription_text: string, optional