try:

    subprocess.check_output(...)

except subprocess.CalledProcessError as e:

    print(e.output)

​

# Basic syntax:

import subprocess

subprocess.run(["your", "command"], capture_output=True, text=True).stderr

# Where:

#   - capture_output=True causes the argument, returncode, stdout, and stderr

#       to be captured and returned in an object like:

#       CompletedProcess(args=['ls'], returncode=0, stdout='sample_data\n', stderr='')

#   - text=True causes the stdout and stderr to be a regular (non-binary) string

#   - .stderr allows you to access just the captured stderr from the process

​

# Example usage:

# I often set things up something like this:

subprocess_output = subprocess.run(["ls", "-l"], capture_output=True, text=True)

if subprocess_output.returncode == 0:

    print("subprocess finished without error")

else:

    print("The following error occurred:\n {}".format(subprocess_output.stderr))