Content inspired from http://www.cyberciti.biz/faq/python-run-external-command-and-get-output/

run_shell_from_python.py

import subprocess

def print_shell_command(cmd):
    ## run it ##
    p = subprocess.Popen(cmd, shell=True, stderr=subprocess.PIPE)
     
    while True:
        out = p.stderr.read(1)
        if out == '' and p.poll() != None:
            break
        if out != '':
            sys.stdout.write(out)
            sys.stdout.flush()


print_shell_command("cd; cd Desktop; ls -lht | grep drw")