使用python备份数据库并删除备份超过一定时长的文件

 #!/usr/bin/env python
 #-*- coding: utf-8 -*-
 """
 @Project:Py
 @author:sandu
 @Email: sandu12345@msn.cn
 @Software: PyCharm
 @file: mysql_class.py
 @time: 2018/1/18 0018 下午 14:02
 """ 

 #导入模块
 import time
 import os

 DATE = time.strftime('%Y%m%d%H%M%S')
 DAYS = 3

 class MysqlBak():

     def __init__(self,DATE,DAYS):
         self.date = DATE
         self.days = DAYS
         self.__DB_HOST = "127.0.0.1"
         self.__DB_PORT = ""
         self.__DB_NAME = "demooil"
         self.__DB_USER = "demooil"
         self.__DB_PASS = "8OvUNQU8CggrahGS"
         self.__BIN_DIR = "/usr/local/mysql/bin/mysqldump"
         self.__OPTIONS = "--skip-extended-insert --skip-lock-tables --set-gtid-purged=OFF --triggers --routines --events"
         self.__MYSQLBACK_DIR = "/home/backup/demooil_bak/"
         self.__filebak_log = "/var/log/mysqlbak.log"
         self.__filerm_log = "/var/log/mysqlrm.log"

     def mysql_bak(self):
         try:
             # all
             mysql_file = self.__MYSQLBACK_DIR + str(self.date) + ".sql"
             os.system("%s -h%s -u%s -p%s %s -d --databases %s > %s" % (self.__BIN_DIR,self.__DB_HOST,self.__DB_USER,self.__DB_PASS,self.__OPTIONS,self.__DB_NAME,mysql_file))
             if os.path.exists(mysql_file):
                 with open(self.__filebak_log,'a') as f_obj:
                     f_obj.write('%s success back file %s \n' %  (self.date[0:8],mysql_file))
         except Exception as e:
             with open(self.__filebak_log, 'a') as f_obj:
                 f_obj.write('%s error back file %s \n' %  (self.date[0:8],mysql_file))
                 f_obj.write("error msg: %s" % e)

     def mysql_rm(self):
         """删除备份目录下超过一定时长的文件"""
         f = list(os.listdir(self.__MYSQLBACK_DIR))
         now_time = self.date[0:8]
         for i in f:
             if i[15:] == 'sql':
                 exit_time = i[0:8]
                 update_time = int(exit_time) + self.days
                 if update_time < int(now_time):
                     os.remove(self.__MYSQLBACK_DIR + i)
                     with open(self.__filerm_log, 'a') as file_log:
                         file_log.write("%s删除备份文件%s \n" % (self.date[0:8], i))

 if __name__ == '__main__':
     mysql_bak = MysqlBak(DATE,DAYS)
     mysql_bak.mysql_bak()
     mysql_bak.mysql_rm()

 # linux定时执行python文件
 # crontab
 # 0 5 * * * /usr/bin/python /root/demooil_mysql_bak.py >/dev/null 2>&1