python下ssh及sftp登录

#author zyh
import paramiko
import os
import datetime
class sshsftp():
 def __init__(self,ipaddr,username,passwd):
  self.ipaddr = ipaddr
  self.username = username
  self.passwd = passwd
 def logg(self,e):
     logpath = '/home/ywjk/jk/sshlogin.log'
     if os.path.isfile(logpath):
      with open(logpath,'a') as log:
          log.write(e)
     log.close()
 def sshlogin(self):
  try:
     ssh = paramiko.SSHClient()
     ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
 # ssh.get_host_keys()
     ssh.connect(self.ipaddr,22,self.username,self.passwd)
     self.logg(str(datetime.datetime.today()) + self.ipaddr + 'login success' +"\n")
  except Exception,e:
     print('ssh %s@%s: %s' % (self.username, self.ipaddr, e) )
     self.logg(str(datetime.datetime.today()) + 'ssh %s@%s: %s' % (self.username, self.ipaddr, e)+"\n")
     quit()
  return ssh
 def sftplogin(self,sshold):
#  sftp = paramiko.SFTPClient.from_transport(ssh.get_transport())
  sftp = sshold.open_sftp()
  return sftp
 def sshclose(self,sshold):
  sshold.close()
 def sftpclose(self,sftpold):
  sftpold.close()