Subprocess in Python

Question

I want the output of the jobs command run in the shell as a string in python.

I have this code

import subprocess p1 = subprocess.Popen(['jobs'], shell=True, stdout=subprocess.PIPE) print p1.communicate()

But this doesnt seem to work. The output I get is -

('', None)

How do I fix this?

Which Python version and OS are you on? It works fine on Linux, Python 2.5.2. — csl
– csl, Commented Sep 19, 2012 at 9:58
What is the value of p1.returncode? (Btw., you don't need shell=True.) — Fred Foo
– Fred Foo, Commented Sep 19, 2012 at 9:58
I believe you are testing different code (the print statement as shown will output a string, not a tuple). Maybe there are other differences besides the print statement, which cause trouble. The code as shown works for me (Linux, Python 2.7.3). — atzz
– atzz, Commented Sep 19, 2012 at 10:03
i copied out the wrong block of code :P.... changed it now though! — ssb
– ssb, Commented Sep 19, 2012 at 13:08

RanRag · Accepted Answer · 2012-09-19 10:08:30Z

You can use subprocess.check_output:

In [5]: import subprocess In [6]: output = subprocess.check_output("ps") In [7]: print output PID TTY TIME CMD 2314 pts/2 00:00:06 bash 4084 pts/2 00:00:03 mpdas 7315 pts/2 00:00:02 python 7399 pts/2 00:00:00 ps In [8]:

Your code works fine for me.

In [11]: import subprocess In [12]: p1 = subprocess.Popen(['ps'], stdout=subprocess.PIPE) In [13]: print p1.communicate()[0] PID TTY TIME CMD 2314 pts/2 00:00:06 bash 4084 pts/2 00:00:03 mpdas 7315 pts/2 00:00:02 python 7682 pts/2 00:00:00 ps In [14]:

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