python socket 模块小型服务器程序有问题

《python web开发学习实录》里 有个小型服务器程序 我照着敲的 有错误 上网查也没有查到

import socket
s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
host=socket.gethostname()
print host
port=1234
s.bind((host,port))
s.listen(5)
while True:
c,addr=s.accept()
print 'lianjielaizi',addr
c.send('success')
c.close()


Traceback (most recent call last):
File "/home/ljc/桌面/so", line 7, in <module>
s.listen(5)
File "/usr/lib/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 95] Operation not supported

求解答