How Can I Retrieve Process Output from `subprocess.call()` in Python?

Retrieving Process Output from subprocess.call()

In Python versions prior to 2.7, obtaining the output from a process invoked using subprocess.call() can be challenging. Passing a StringIO.StringIO object to the stdout argument triggers an error due to the lack of a 'fileno' attribute in StringIO objects.

Solution

For Python versions 2.7 and above, the subprocess.check_output function provides a straightforward solution. It combines the execution of a subprocess with the capture and return of its standard output as a string.

For example (tested on Linux):

import subprocess

output = subprocess.check_output(['ping', '-c', '1', '8.8.8.8'])

print(output)

Note that the ping command uses the Linux notation (-c for count). For Windows, change it to -n.

For further details, refer to the more comprehensive answer in this [other post](https://stackoverflow.com/a/5647266/6214952).

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