$pwd
/home/jeffrin/beautifulwork/github
$ls
beautifulwork-github.php  beautifulwork-github.py
$ls -l
total 8
-rw-r--r-- 1 jeffrin jeffrin  414 Dec 10  2016 beautifulwork-github.php
-rw-r--r-- 1 jeffrin jeffrin 1300 Dec 10  2016 beautifulwork-github.py
$cat ../../ls.py 
from subprocess import call
call(["ls", "-l"])
$python ../../ls.py 
total 8
-rw-r--r-- 1 jeffrin jeffrin  414 Dec 10  2016 beautifulwork-github.php
-rw-r--r-- 1 jeffrin jeffrin 1300 Dec 10  2016 beautifulwork-github.py
$