python多线程备份MYSQL数据库并删除旧的备份。

 #!/usr/bin/python
 # -*- coding=utf-8 -*-
 import time
 import os
 import datetime
 import threading
 from time import ctime,sleep

 date=time.strftime('%Y-%m-%d',time.localtime(time.time()))
 dbname=('test','test2') #定义元组必须要有多个，要不则循环里面的字符。
 dbname2=('test3','test4')
 bkdir="/backup/mysqlbk/"

 #删除超过3天的备份文件
 now_time = datetime.datetime.now()
 yes_time = now_time + datetime.timedelta(days=-3)
 out_time = yes_time.strftime('%Y-%m-%d')

 def dumpsql():
     for i in dbname:
         os.system("/usr/local/mysql/bin/mysqldump -u%s %s | gzip > %s%s" % ("root",i,bkdir,date+"."+i+".sql.gz"))

 def dumpsql2():
     for i in dbname2:
         os.system("/usr/local/mysql/bin/mysqldump -u%s %s | gzip > %s%s" % ("root",i,bkdir,date+"."+i+".sql.gz"))

 def outbk():
     for i in dbname:
         if os.path.exists(bkdir+out_time+'.'+i+'.sql.gz'):
             os.remove(bkdir+out_time+'.'+i+'.sql.gz')

 #双线程
 threads=[]
 t1 = threading.Thread(target=dumpsql)
 threads.append(t1)
 t2 = threading.Thread(target=dumpsql2)
 threads.append(t2)

 if __name__ == "__main__":
     outbk()
     for t in threads:
         t.setDaemon(True)   #启动多线程
         t.start()
     t.join()
     print ("all over %s" %ctime())