Processing output from cmdline via a Python script

I'm trying to use the subprocess module with Python 2.6 in order to run a command and get its output. The command is typically ran like this:

/usr/local/sbin/kamctl fifo profile_get_size myprofile | awk -F ':: ' '{print $2}'

What's 开发者_如何学JAVAthe best way to use the subprocess module in my script to execute that command with those arguments and get the return value from the command? I'm using Python 2.6.

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Do you want the output, the return value (AKA status code), or both?

If the amount of data emitted by the pipeline on stdout and/or stderr is not too large, it's pretty simple to get "all of the above":

import subprocess

s = """/usr/local/sbin/kamctl fifo profile_get_size myprofile | awk -F ':: ' '{print $2}'"""

p = subprocess.Popen(s, shell=True, stdout=subprocess.PIPE)

out, err = p.communicate()

print 'out: %r' % out
print 'err: %r' % err
print 'status: %r' % p.returncode

If you have to deal with potentially huge amounts of output, it takes a bit more code -- doesn't look like you should have that problem, judging from the pipeline in question.

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f.e. stdout you can get like this:

>>> import subprocess
>>> process = subprocess.Popen("echo 'test'", shell=True, stdout=subprocess.PIPE)
>>> process.wait()
0
>>> process.stdout.read()
'test\n'