<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def get_notifications(self) -> List[Notification]: """Get available notifications, which can then be subscribed to. Call :func:activate: to enable notifications, and :func:listen_notifications: to loop forever for notifications. :return: List of Notification objects """

        notifications = []
        for serv in self.services:
            for notification in self.services[serv].notifications:
                notifications.append(notification)
        return notifications