[PYTHON] Get the GNOME version

#!/usr/bin/env python

import os.path
import subprocess
import re

def _splitLines(string):
    ptn = re.compile('\n')
    return ptn.split(string)

def _ptnextract(string):
	ptn = re.compile('^.+(\d+).(\d+).(\d+).*$')
	(ver, rev1, rev2) = ptn.split(string)[1:4]
	return ver

gnomesessions='/usr/bin/gnome-session'
if os.path.exists(gnomesessions):
    print _ptnextract(subprocess.Popen([gnomesessions,'--version'], stdout=subprocess.PIPE).communicate()[0])

gnomeabout='/usr/bin/gnome-about'
if os.path.exists(gnomeabout):
    print _ptnextract(_splitLines(subprocess.Popen([gnomeabout,'--gnome-version'], stdout=subprocess.PIPE).communicate()[0])[0])

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