python从网络端口读取文本数据

# To test it with netcat,start the script and execute:
#
#    echo "Hello,cat." | ncat.exe 127.0.0.1 12345
#
import socket
 
HOST = 'localhost'   # use '' to expose to all networks
PORT = 12345
 
def incoming(host,port):
  """Open specified port and return file-like object"""
  sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
  # set SOL_SOCKET.SO_REUSEADDR=1 to reuse the socket if
  # needed later without waiting for timeout (after it is
  # closed,for example)
  sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
  sock.bind((host,port))
  sock.listen(0)   # do not queue connections
  request,addr = sock.accept()
  return request.makefile('r',0)
# /-- network ---
 
 
for line in incoming(HOST,PORT):
  print line,