How Can I Capture and Store the Output of a subprocess.Popen Call as a String in Python?

Storing Output of subprocess.Popen Call in a String

In Python programming, using the subprocess module allows you to execute system calls and capture their output. This article provides solutions for storing the output of a subprocess.Popen call in a string variable.

Solution for Python 2.7 or Python 3

Python provides the subprocess.check_output() function, specifically designed for capturing the output of a command into a string. Simply use it as follows:

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

Solution for Python 2.4-2.6

For Python versions 2.4 to 2.6, you can utilize the communicate method of Popen:

import subprocess
p = subprocess.Popen(["ntpq", "-p"], stdout=subprocess.PIPE)
out, err = p.communicate()

The out variable in the above code contains the desired output.

Note Regarding Command Input

When utilizing Popen, it's crucial to pass the command as a list of strings, as shown in the examples provided. This is because Popen does not invoke the shell.

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