def _last_index(self, s):
        self.set_index(max(0, self._find_one_after_last_labeled_index() - 1))
def __init__(self, region, name, retention_in_days=7):
    super(LogGroup, self).__init__()
    self.region = region
    self.name = name
    self.retention_in_days = retention_in_days