Here comes the Sun

问题：

您要通过python的subprocess模块执行一些命令，要在程序中获得命令的标准输出，此外，命令中还有管道操作。

解决：

以这个命令为例：
cat /home/admin/deploy/log/2009-11-11.log ｜grep example.com ｜wc -l

import subprocess

cmd1 = 'cat /home/admin/deploy/log/2009-11-11.log'
cmd2 = 'grep example.com'
cmd3 = 'wc -l'

pipe1 = subprocess.Popen(cmd1.split(), stdout=subprocess.PIPE)
pipe2 = subprocess.Popen(cmd2.split(), stdin=pipe1, stdout=subprocess.PIPE)
pipe3 = subprocess.Popen(cmd3.split(), stdin=pipe2, stdout=subprocess.PIPE)

result = pipe3.communicate()[0]