AttributeError: 'module' object has no attribute 'check_output' | popen & PIPE

Question

I am writing a script and got it to work run and did everything I wanted it to. I want to add in a function to have my dictionary sleep after checking it but when I add the time.sleep(5) <-(5 seconds) it now throws me this error

AttributeError: 'module' object has no attribute 'check_output'

On this line of code

 print ("INFO: checking kswapd number of process and cputime, check for TIME colume for how busy kswapd was" +  subprocess.check_output("ps -C kswapd0 -C kswapd1 -C kswapd2 -C kswapd3 -C kswapd4  -o pid,ppid,stime,etime,time,pcpu,args", shell=True))

Any one know how I could use Pipe and Popen to get around using subprocess.check_output?

Or here is where I put the time.sleep() if you see that its not the right for any reason

with open("/proc/meminfo") as f:
sample1 = []
for line in f:
    if line.startswith(pre):
        v = line.rsplit(None, 2)[1]
        sample1.append(v)
        time.sleep(5)

I am in Python v2.6, and no I cannot upgrade otherwise I would! Thanks for any input!

Did you call your python program subprocess.py by any chance? Is your indentation wrong on the question or in your program? The body of the code after the with should be indented. — cdarke
– cdarke, Commented Jul 20, 2015 at 13:16

ElmoVanKielmo · Accepted Answer · 2016-05-25 12:18:33Z

3

You are using subprocess module from Python's standard library and this module indeed doesn't have an attribute check_output.

Assuming that you are using it like this:

import subprocess

child = Popen(["mycmd", "myarg"], stdout=PIPE)

you should call child.communicate()[0] and not subprocess.check_output() to see the output in Python 2.6.

edited May 25, 2016 at 12:18

answered Jul 20, 2015 at 13:52

ElmoVanKielmo

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2 Comments

LtWorf Over a year ago

What are you talking about? Perhaps you are using a very old version of Python.

ElmoVanKielmo Over a year ago

@LtWorf OP says in the question that he is using Python 2.6 and can't upgrade. There's no check_output in subprocess module in Python 2.6. I indeed had a erroneously pasted .check_output() as it's absent on the Popen instance as well.

FunkySayu · Accepted Answer · 2015-07-20 13:08:39Z

2

From the subprocess documentation :

output = Popen(["mycmd", "myarg"], stdout=PIPE).communicate()[0]

answered Jul 20, 2015 at 13:08

FunkySayu

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4 Comments

FunkySayu Over a year ago

Ho wait, maybe i didn't get all the question. Is it time.sleep(5) that throws you this error ?

ShuKaibutsu Over a year ago

yes it is. if I comment it out it works fine but when I keep it, it throws the error

FunkySayu Over a year ago

This is weird... It should not happen. Are you sure that your install of python site-packages is not a downgrade of the Python2.7 or higher site-packages ?

FunkySayu Over a year ago

Also are you sure there's not any errors in your import time ? (like another python file or whatever) I do not find anything about this message

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