How Can I Capture Subprocess Output as a String in Python?

Capturing Subprocess Output in a String

To capture the output of a system call initiated through Python's subprocess.Popen and store it in a string, Python provides several options depending on the version you're using.

Python 2.7 or Python 3:

Leverage the subprocess.check_output() function:

from subprocess import check_output
output = check_output(["ntpq", "-p"])

Python 2.4-2.6:

Employ the Popen command's communicate method:

import subprocess
process = subprocess.Popen(["ntpq", "-p"], stdout=subprocess.PIPE)
output, _ = process.communicate()

Note that when specifying the command, separate the executable and options into a list, such as ["ntpq", "-p"], as Popen does not invoke a shell.

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