GetExtIp

from urllib2 import urlopen
import cStringIO
import sys
import smtplib
import os

#Get External IP

ip = urlopen('http://www.icanhazip.com').read()

#Check if extip.txt exists

if os.access('/home/sublim3/Coding/Python/extip', os.F_OK):
        print "Good"
else:
        f = open("extip.txt", 'w')
        f.close()

#Compare External IP with File

f = open("extip.txt", 'r')
text = f.readline()
if text == ip:
        f.close()
        exit()
else:
        with open('extip.txt', 'w') as f:
                f.write(ip)

        ##Send mail

        fromaddr = 'example@example.com'
        toaddr = 'example@example.com'
        msg = ip

        #Credentials
        username = 'user'
        password = 'pass'

        #Mail Send
        server = smtplib.SMTP('smtp.gmail.com:587')
        server.starttls()
        server.login(username,password)
        server.sendmail(fromaddr,toaddr,msg)
        server.quit()
        f.close()