Displaying IP address of wlan0 on LCD.

ip_only.py

#!/usr/bin/python

from Adafruit_CharLCD import Adafruit_CharLCD
from subprocess import * 
from time import sleep, strftime
from datetime import datetime

lcd = Adafruit_CharLCD()

cmd = "ip -4 addr show wlan0 | grep inet | awk '{print $2}' | cut -d/ -f1"

lcd.begin(16,1)

def run_cmd(cmd):
        p = Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
        output = p.communicate()[0]
	if p.returncode != 0:
		return None
        return output

lcd.message("Obtaining IP\n")
lcd.message("...")
while 1:
	lcd.clear()
	ipaddr = run_cmd(cmd)
	if ipaddr:
		lcd.message("wlan0 IP Addr:\n")
		lcd.message(ipaddr)
		break
	sleep(5)