Python定期从SVN更新文件

import time,os,sys,svnconfig

dist=svnconfig.setting['dist']
os.chdir(svnconfig.setting['svn'])

def checkout():
    svnconfig.setting['dist']=dist+time.strftime('%Y-%m-%d-%H-%M-%S',time.localtime())
    cmd='svn export %(url)s %(dist)s --username %(user)s --passWord %(pwd)s'%svnconfig.setting
    print "execute %s"%cmd
    #print os.popen(cmd).read()
    return os.system(cmd)

while True:
    ret=checkout()
    if(ret==0):
        print 'check out success'
    else:
        print 'check out fail'
    time.sleep(svnconfig.setting['interval'])

setting={
    'svn':'C:/Program Files/Subversion/bin/',#svn的程序所在路径
    'url':'Http://www.xxx.com/svn/project/trunk',#svn地址
    'user':'xxx,#用户名
    'pwd':'xxx',#密码
    'dist':'D:/svn/',#目标地址
    'interval':15 #更新时间
}