code: def iter_notifications(self, all=False, participating=False, since=None,
                             number=-1, etag=None):
          
          url = self._build_url('notifications', base_url=self._api)
          params = {
              'all': all,
              'participating': participating,
              'since': timestamp_parameter(since)
          }
          for (k, v) in list(params.items()):
              if not v:
                  del params[k]
          return self._iter(int(number), url, Thread, params, etag)
docs: Iterates over the notifications for this repository.
  
          :param bool all: (optional), show all notifications, including ones
              marked as read
          :param bool participating: (optional), show only the notifications the
              user is participating in directly
          :param since: (optional), filters out any notifications updated
              before the given time. This can be a `datetime` or an `ISO8601`
              formatted date string, e.g., 2012-05-20T23:10:27Z
          :type since: datetime or string
          :param str etag: (optional), ETag from a previous request to the same
              endpoint
          :returns: generator of :class:`Thread <github3.notifications.Thread>`