I use Python to execute the template of system commands

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from subprocess import Popen, PIPE, STDOUT

command='uname -a'. split()

proc=Popen(command,bufsize=0, stdout=PIPE,stderr=PIPE, universal_newlines=True);
output, error = proc. communicate()
exit_code=proc.poll()

if (exit_code==0):
  print(output)
else:
  print(error)