Linux自动定时备份文件夹Python脚本

#!/usr/bin/python
# -*- coding: utf-8 -*-

import os
import re
import tarfile
import datetime
import pexpect

basedir='/data/bak/'
iplist=['167', '178', '179', '180', '181', '182']
def get_list(txt_file):
    ret_list = []
    fin = open(txt_file,'r')
    for line in fin:
        if (re.match('^\\s*$',line)):     #跳过是空白的行 
            continue
        else:
            line = line.lstrip()
            line = line.rstrip()  #将回车（\n）去掉
            ret_list.append(line)
    #print('debug info of get_list :\n',ret_list)
    return ret_list
    
def copy_svn(filelist): #这个函数主要是完成对文件夹的打包工作
    name= []
    name=os.path.split(filelist)
    now = datetime.datetime.now()
    #filename = now.strftime(basedir + iplist[0]+name[-1]+ '_%Y%m%d_%H%M%S.dump')
    #os.system('svnadmin dump ' + filelist +' > '+filename )
  
    tarname =  now.strftime(basedir +iplist[0]+name[-1]+ '_%Y%m%d_%H%M%S.tar.gz')
    #print tarname
    tar = tarfile.open(tarname, 'w|gz')
    tar.add(filelist+'/') #加最后的‘/’是为了打包当前目录，否则会将父目录整体打包，为了保持与dump脚本一致性做的修改
    tar.close()
    
    #调用pexcept
    scp = pexpect.spawn('scp -r ' +  tarname  + ' root@IP:/data/databak/FilesBack/')
    scp.expect('.ssword:*')
    scp.sendline('roamer@hisap2')  
    scp.expect(pexpect.EOF, timeout=None) 
    
    olddate = (now - datetime.timedelta(5)).strftime("%Y%m%d")
    print olddate
       
    for i in os.listdir(basedir):
        file = re.search(r'\w*[_](\d{8})[_]\d{6}.(tar.gz|dump)', i)
        #print i, file
        if file and olddate>=file.group(1):
            os.remove(basedir + file.group(0))
            print 'del:', file.group(0)
            filelog=open(basedir+"bak_doc.log", "a")
            filelog.write("============DATE:%s============= \n"%now.strftime("%Y%m%d"))
            filelog.write("del file:%s \n" % (basedir+file.group(0) ))
            filelog.write("============DATE:%s============= \n"%now.strftime("%Y%m%d"))
            filelog.close()
            
            
def copy_files(txt_file):
    geted_list = get_list(txt_file)
    for file in geted_list:
        copy_svn(file)
    
if __name__ == '__main__':
    copy_files('/data/bak/bak_doc.txt')
    print '='*20,'\ncopy_OKOKOK\n','='*20