python实践，文件备份

import osimport timesource = ['E:\\001','E:\\002']target_dir = 'E:\\02'target = target_dir + os.sep + time.strftime('%Y%m%d%H%M%S') + '.zip'if not os.path.exists(target_dir):    os.mkdir(target_dir)zip_command = 'zip -r {0} {1}'.format(target,' '.join(source))print('Zip command is:')print(zip_command)print('running:')if os.system(zip_command)==0:    print('Successful backup to',target)else:    print('Backup Failed')