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user_id=410460

Perhaps, it would be better to raise exception:

def readwrite(obj, flags):
    try:
        if flags & (select.POLLIN | select.POLLPRI):
            obj.handle_read_event()
        if flags & select.POLLOUT:
            obj.handle_write_event()
        if flags & (select.POLLERR | select.POLLHUP |
select.POLLNVAL):
            obj.handle_expt_event()
    except ExitNow:
        raise
    except:
        obj.handle_error()

...

    def handle_expt_event(self):
        err = self.socket.getsockopt(socket.SOL_SOCKET,
socket.SO_ERROR)
        assert(err != 0)
        raise socket.error, (err, errorcode[err])

Since asyncore closes socket in handle_error, this solves
the problem too.