Mark, try this:

        if flags & select.POLLIN and (obj.connected or obj.accepting):
            obj.handle_read_event()
        if flags & select.POLLOUT and obj.connected:
            obj.handle_write_event()
        if flags & select.POLLPRI and obj.connected:
            obj.handle_expt_event()
        if flags & (select.POLLHUP | select.POLLERR | select.POLLNVAL):
            obj.handle_close()