I'm trying to make a system call in Python and store the output to a string that I can manipulate in the Python program.
#!/usr/bin/python import subprocess p2 = subprocess.Popen("ntpq -p")
I've tried a few things including some of the suggestions here:
but without any luck.
In Python 2.7 or Python 3
Instead of making a
Popen object directly, you can use the
subprocess.check_output() function to store output of a command in a string:
from subprocess import check_output out = check_output(["ntpq", "-p"])
In Python 2.4-2.6
import subprocess p = subprocess.Popen(["ntpq", "-p"], stdout=subprocess.PIPE) out, err = p.communicate()
out is what you want.
Important note about the other answers
Note how I passed in the command. The
"ntpq -p" example brings up another matter. Since
Popen does not invoke the shell, you would use a list of the command and options—
This worked for me for redirecting stdout (stderr can be handled similarly):
from subprocess import Popen, PIPE pipe = Popen(path, stdout=PIPE) text = pipe.communicate()
If it doesn't work for you, please specify exactly the problem you're having.