python使用socket遠程連接錯誤處理方法

import socket, sys
host = sys.argv[1]
textport = sys.argv[2]
filename = sys.argv[3]
try:
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except socket.error, e:
 print "Strange error creating socket: %s" % e
 sys.exit(1)
try:
 port = int(textport)
except ValueError:
 print "Couldn't find your port: %s" % e
 sys.exit(1)
try:
 s.connect((host, port))
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)
try:
 s.sendall("GET %s HTTP/1.0

" % filename)
except socket.error, e:
 print "Error sending data: %s" % e
 sys.exit(1)
while 1:
 try:
 buf = s.recv(2048)
 except socket.error, e:
 print "Error receiving data: %s" % e
 sys.exit(1)
 if not len(buf):
 break
 sys.stdout.write(buf)