python模块paramiko实现上传下载与远程执行命令的代码

#!/usr/bin/env python
#edit: www.jb200.com
#
import paramiko  
hostname='192.168.0.102' 
username='root' 
password='abc'  
port=22    
paramiko.util.log_to_file('paramiko.log')         
s=paramiko.SSHClient()                
s.set_missing_host_key_policy(paramiko.AutoAddPolicy())         
s.connect(hostname = hostname,port=port,username=username, password=password)         
stdin,stdout,stderr=s.exec_command('free;df -h')         
print stdout.read()         
s.close()

#!/usr/bin/env python 
#edit: www.jb200.com
#
import paramiko,datetime,os
hostname='192.168.0.102' 
username='root' 
password='abc123' 
port=22 
local_dir='/tmp/' 
remote_dir='/tmp/test/'
try:
    t=paramiko.Transport((hostname,port))         
    t.connect(username=username,password=password)         
    sftp=paramiko.SFTPClient.from_transport(t) 
    #files=sftp.listdir(dir_path)         
    files=sftp.listdir(remote_dir)         
    for f in files:                 
        print ''                 
        print '#-------------------------------------------------'                 
        print 'Beginning to download file  from %s  %s ' % (hostname,datetime.datetime.now())               
        print 'Downloading file:',os.path.join(remote_dir,f)
        sftp.get(os.path.join(remote_dir,f),os.path.join(local_dir,f))#下载              
        #sftp.put(os.path.join(local_dir,f),os.path.join(remote_dir,f))#上传                
        print 'Download file success %s ' % datetime.datetime.now()       
        print ''                 
        print '#-------------------------------------------------'  
    t.close()
except Exception: 
       print "connect error!"