python备份mysql数据库

原本可以用shell完成的功能，现在学习python，就照抄照改。完成数据库备份。

#!/usr/bin/python
#-*-coding:utf-8-*-
#MYSQL BACK
import string,time,os,datetime
import sys,logging,stat
import subprocess
#os.environ.get(‘PERONA_A’)
os.environ["PATH"]="/usr/local/mysql/bin/:"
# os.putenv("PATH","/usr/local/mysql/bin/:")
#os.putenv(“PATH”,”/usr/bin/”)
# os.environ["PATH"]
year= time.strftime('%Y',time.localtime(time.time()))
moth= time.strftime('%m',time.localtime(time.time()))
data_path ="/mysqlbak/"+year+"/"+moth+"/"
sql_user ="root"
sql_pwd ="sh123456"
sql_ip ="127.0.0.1"
all="--all-databases --events"
def loger(datapath,logfile="mysqlbak.log"):
    """创建日志文件"""
    if not os.path.exists(datapath):
        os.makedirs(datapath)
    log_filename = datapath+logfile
    log_format = '%(filename)s [%(asctime)s] [%(levelname)s] %(message)s'     
    logging.basicConfig(filename=log_filename,format=log_format,datefmt='%Y-%m-%d %H:%M:%S %p',level=logging.DEBUG)
#----------------------------------------------------------------------
def ClearDir(dir,age):
    """删除几天前的文件，age为时间长，如（86400为一天）"""
    for file in os.listdir(dir):
        now = time.time()
        filepath = os.path.join(dir,file)
        files = os.stat(filepath).st_mtime
        if files < now - age:
            if os.path.isfile(filepath):
                os.remove(filepath)
                logging.info("%s remove success!!!" % filepath)
   
def mysql_backup(filename):
    backup_name = data_path+filename+"%s.sql" %(time.strftime("%Y%m%d%H%M"))  
    sql_comm ='mysqldump %s -h%s -u%s -p%s > %s'%(all,sql_ip,sql_user,sql_pwd,backup_name)
    #print sql_comm
    if os.system(sql_comm) ==0:
        return logging.info("%s back success!!!!" %backup_name)
        #print "scuess ！"
    else:
        return logging.error("%s back Failed!!!" %backup_name)
        #print "Failer !!!!"
#----------------------------------------------------------------------
   
if __name__ =="__main__":
    loger(data_path)
    SQL_backup =mysql_backup("app_")
    ClearDir(data_path,(7 * 86400))