Python - calling external programs

gistfile1.txt

if you want the process's exitcode, subprocess.call() returns that. If you want to execute something and raise an exception if it fails, subprocess.check_call() does that. If you want something more complicated, including a conversation with the process you're starting or simply not waiting for the process to end, subprocess.Popen is what you want.

import subprocess
r=subprocess.check_call(["ls"])
r=subprocess.call(["ls"])
r = subprocess.Popen(["ls"])