            # start later, then the interval cannot overlap!
            # This inclues intervals which both start and end before the given span, so
            # we need to check that the end of the interval is at least after the
            for intvl in self._by_start.irange(maximum=(end - 1, sys.maxsize, sys.maxsize)):
                if intvl[0] == intvl[1]:  # we need to check a zero length interval
                    if intvl[0] &gt;= start:
                        yield intvl
                else:
 