code: def add(self, item):
          '''Add *item*.'''
          if not item in self:
              index = bisect.bisect_right(self._members, item)
              self._members.insert(index, itemf add(self, item):
          '''Add *item*.'''
          if not item in self:
              index = bisect.bisect_right(self._members, item)
              self._members.insert(index, item)
docs: Add *item*.