python 执行dos命令，获取返回值

有时执行dos命令需要保存返回值

需要导入库subprocess

import subprocess

p = subprocess.Popen('ping www.baidu.com', shell=True, stdout=subprocess.PIPE)
out, err = p.communicate()
print out.splitlines()[24:27]
for line in out.splitlines():
    print line

splitlines 是个列表

可以切片操作