subprocess

subprocess modules allows you to spawn new processes, interact with file descriptors, and obtain exit codes. The recommended approach is to use the run() function as default, which runs a CLI command with options as a list of strings and returns a CompletedProcess instance.
Execute shell command Unlike os.system, subprocess.run() takes a list of arguments.

subprocess.run(['ls','-l,'.'], 0)

Set capture_output to True to save output, stored as property stdout of the returned object.

data = subprocess.run(['ls,'-l','.'], 0, capture_output=True)

The data is stored as a bytestring, which can be decoded to a normal string.

data.stdout.decode('utf-8')

This return a CompletedProcess instance with the command's output stored under the stdout property

subprocess.run(['ls','-l','/dev/null'], capture_output=True)

This will raise a CalledProcessError exception because of the non-zero exit code

subprocess.run('exit 1', shell=True, check=True)