<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def take_notification(self, block=True, timeout=None):
 """Attempt to retrieve one notification from the queue of received notifications. If block is True, the call will wait until a notification is received. If timeout is a number greater than 0, the call will wait that many seconds to receive a notification before timing out. If there is no notification available when block is False or when the timeout has elapse, None will be returned. Otherwise a :class:`~ncclient.operations.notify.Notification` object will be returned. """

        return self._session.take_notification(block, timeout)