python--做远程scp的进度条

import sys
import os
import threading,multiprocessing
import pexpect
import time,paramiko
def scopy():
 ld=pexpect.spawn('scp -r /data/rhel-server-6.3-x86_64-dvd.iso root@192.168.2.3:/back/')
 ld.expect('password:',timeout=None)
 ld.sendline('zhengbin110')
        ld.expect(pexpect.EOF,timeout=None)
 #ld.read()
def view_bar(num=1, sum=100, bar_word=":"):
   rate = float(num) / float(sum)
   rate_num = int(rate * 100)
   print '\r%d%% :' %(rate_num),
   for i in range(int(num)/10):
       os.write(1, bar_word)
   sys.stdout.flush()
def huoqu():
 host='192.168.2.3'
 user='root'
 passwd='zhengbin110'
 port=22
 try:
  ssh=paramiko.SSHClient()
  ssh.load_system_host_keys()
  ssh.connect(host,port,user,passwd)
 #stdin,stdout,stderr=ssh.exec_command('ls /home')
  stdin,stdout,stderr=ssh.exec_command('du -s /back')
  abc=stdout.readlines()[0].split()[0]
  return abc
 except Exception,e:
  return 0
if __name__=='__main__':
 global count,mutex
 count=1
 t=multiprocessing.Process(target=scopy,args=())
 t.start()
 while (1):
 time.sleep(1)
 x=huoqu()
  bili=float(x)/float(os.popen('du -s /data/rhel-server-6.3-x86_64-dvd.iso').readlines()[0].split()[0])*100
 view_bar(bili,100,bar_word="#")
 if int(bili) == 100:
 break
 print "COPY IS FINISH!!!!"
 t.join()