使用python备份指定目录并删除备份超过一定时长的文件

 #!/usr/bin/env python
 #-*- coding: utf-8 -*-
 """
 @Project:Py
 @author:
 @Email:
 @Software: PyCharm
 @file: test_rm.py
 @time: 2018/1/17 0017 下午 14:14
 """

 import os
 import time

 # 备份的指定目录
 source = ['/usr/local/src/test1/']
 # 备份文件存放路径
 target_dir='/home/backup/'
 # 备份时长
 data = 3
 # 备份日志
 filebak_log = "/var/log/filebak.log"
 # 删除备份文件日志
 filerm_log = "/var/log/filerm.log"

 def file_bak():
     """备份指定目录下的文件"""
     target=target_dir+time.strftime('%Y%m%d%H%M%S')+'.tar.gz'
     cmd='tar -zcPf %s %s '%(target,' '.join(source))
     if os.system(cmd)==0 :
         with open(filebak_log,'a') as filebak:
             filebak.write('successfull backup to %s \n' % target)

 # crontab
 # 0 4 * * * /usr/bin/python /root/demooil_bak.py >> /var/log/demooil_bak.py.log 2>&1

 def file_rm():
     """删除备份目录下超过一定时长的文件"""
     f = list(os.listdir(target_dir))
     now_time = time.strftime('%Y%m%d%H%M%S')[0:8]
     for i in f:
         if i[15:] == 'tar.gz':
             exit_time = i[0:8]
             update_time = int(exit_time) + data
             if update_time < int(now_time):
                 os.remove(target_dir+i)
                 with open(filerm_log,'a') as file_log:
                     file_log.write("%s删除备份文件%s \n" % (now_time,i))

 if __name__ == '__main__':
     file_bak()
     file_rm()