python实现带错误处理功能的远程文件读取方法

import socket, sys, time
host = sys.argv[1]
textport = "80"
filename = sys.argv[3]
try:
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 port = int(textport)
 s.connect((host, port))
 fd = s.makefile('rw', 0)
 print "sleeping..."
 time.sleep(10)
 print "Continuing."
 fd.write("GET %s HTTP/1.0

" % filename)
 fd.flush() 
 s.shutdown(1) 
except socket.gaierror, e:
 print "Address-related error connecting to server: %s" % e
 sys.exit(1)
except socket.error, e:
 print "Connection error: %s" % e
 sys.exit(1)
while 1:
 try:
 buf = fd.read(2048)
 except socket.error, e:
 print "Error receiving data: %s" % e
 sys.exit(1)
 if not len(buf):
 break
 sys.stdout.write(buf)