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())