Suppress stderr within subprocess.check_output()

Just tell subprocess to redirect it for you:

import subprocess
    
output = subprocess.check_output(
    "netstat -nptl".split(), stderr=subprocess.DEVNULL
)

For python 2, it’s a bit more verbose.

import os
import subprocess

with open(os.devnull, 'w') as devnull:
    output = subprocess.check_output(
        "netstat -nptl".split(), stderr=devnull
    )