python 调用rar命令行 压缩文件

import os
import time

source = [r‘D:\Work\Python\Demo‘, ‘d:\\work\\linux‘]
target_dir = ‘D:\\Work\\backup\\‘

target = target_dir + time.strftime(‘%Y%m%d%H%M%S‘) + ‘.rar‘
zip_command = "rar a %s %s" % (target, ‘ ‘.join(source))

if os.system(zip_command) == 0:
    print ‘Sucessful backup to‘, target
else:
    print ‘Backup Failed‘