i use socket such as :
        self.socket.setblocking(1)
        self.socket.settimeout(1)
but this socket is no-block ,i find socketmodule.c sock_settimeout

    s->sock_timeout = timeout;
    internal_setblocking(s, timeout < 0.0);

if timeout >0, so internal_setblocking(s,false=0),so socket is no-block

by the way:
  in sock_settimeout,call internal_setblocking params have error?

init_sockobject:
    if (defaulttimeout >= 0.0)
        internal_setblocking(s, 0);

Yes, this is normal. Timeout sockets use a non-blocking fd internally:
http://docs.python.org/dev/library/socket.html#notes-on-socket-timeouts

This won't be visible to you if you only use the socket object, but it will if you call fileno() and use the file descriptor directly.

how to create socket and have block timeout mode?

        self.socket.setblocking(1)
        self.socket.settimeout(1)
this program is error?

Frank, this bug tracker is not for posting general programming questions.
Please see http://mail.python.org/mailman/listinfo/python-list instead.