How Can I Silently Run a Subprocess in Python on Ubuntu and Suppress its Output?

Silencing Subprocess Output on Ubuntu

In the provided Python script, eSpeak clutter's the shell with unwanted error messages. The goal is to suppress this output while preserving the desired audible response. Despite not finding a direct way to suppress eSpeak's verbosity, a solution exists to visually silence its output.

Redirecting Output in Python >= 3.3

To effectively hide the output, redirect it to a null device using the DEVNULL attribute:

import subprocess

subprocess.call(['echo', 'foo'],
    stdout=subprocess.DEVNULL,
    stderr=subprocess.STDOUT)

Redirecting Output in Python

For versions prior to Python 3.3, use the following approach:

import os
FNULL = open(os.devnull, 'w')
subprocess.call(['echo', 'foo'],
    stdout=FNULL,
    stderr=subprocess.STDOUT)

Similarities to Shell Command

The provided solution is similar to running the following shell command:

retcode = os.system("echo 'foo' > /dev/null")

By redirecting the output to /dev/null, the clutter is effectively hidden, leaving the shell clean for further interactions.

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