Python Application to Kill a Process

killprocess.py

import subprocess, signal
import os
import re

a_process = "postgres"

def is_running(process):
	s = subprocess.Popen(["ps", "axw"],stdout=subprocess.PIPE)
	for x in s.stdout:
		if re.search(process, x):
			return True
	return False

if is_running(a_process):
	p = subprocess.Popen(['ps', '-A'], stdout=subprocess.PIPE)
	out, err = p.communicate()
	for line in out.splitlines():
		if a_process in line:
			pid = int(line.split(None, 1)[0])
			print os.system('kill -9 ' + str(pid))