getip.py

#!/usr/bin/python

import os
import re
import subprocess

tty = subprocess.check_output("tty")

m = re.match(r"/dev/(.+)", tty)
line = ".+ " + m.group(1) + " .+"

who = subprocess.check_output("who")

ip = ""

for l in who.split('\n'):
    if re.match(line, l):
        m = re.match(r".+\((.+)\).*", l)
        if m:
           ip = m.group(1)

print "ip = " + ip