test-run.py

import subprocess
import shlex

def _run(command):
    """subprocess wrapper to execute system commands, command is expected as string"""
    try:
        p = subprocess.Popen(shlex.split(command),
                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)

        output, error = p.communicate()
        exit_code = p.returncode
        
        return (output, error, exit_code)
    except OSError:
        # here you whould normaly log the error and raise some custom exception
        # we return data to keep it simple
        return (None, "Cannot execute command {0}".format(commad), 1)