IPTrak Python IP Address Lookup Tool (CLI)

# IP Address Lookup Tool
# Version 1.0.0
# Coded by BlackMan in Python 3.3.2
# Download : N/A
# File     : iptrak.py

#IMPORTS
import re
import sys
import urllib.request

#BYTE CONTROL
def encodeString(string) : return string.encode('utf-8')
def decodeString(string) : return string.decode('utf-8')

#DEBUG MESSAGES
def action(msg)    : print('[#] - ' + msg)
def alert(msg)     : print('[+] - ' + msg)
def error(msg)     : print('[!] - ' + msg)
def errorExit(msg) : raise SystemExit('[!] - ' + msg)

#GET BETWEEN
def getBetween(source, start, stop):
    search = encodeString(start + '(.*?)' + stop)
    data   = re.compile(search).search(source)
    if data:
        found = decodeString(data.group(1))
        return found.replace('\n', '')
    else:
        return False

#GET IP INFORMATION
def getIP(ip):
    source  = urllib.request.urlopen('http://www.whatismyipaddress.com/ip/' + ip).read()
    country = getBetween(source, 'Country:</th><td>', ' <img ')
    state   = getBetween(source, 'State/Region:</th><td>', '</td>')
    city    = getBetween(source, 'City:</th><td>', '</td>')
    isp     = getBetween(source, 'ISP:</th><td>', '</td>')
    return [isp, country, state, city]

#VERIFY IP ADDRESS
def verifyIP(ip):
    if re.match('^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$', ip):
        return True
    else:
        return False

#VERSION CHECK (sys)
def versionCheck():
    if sys.version_info.major != 3 or sys.version_info.minor != 3:
        errorExit('Requires Python version 3.3 to be installed.')

#START
versionCheck()
if len(sys.argv) != 2:
    error('Missing command line arguments!')
    errorExit('Usage : iptrak.py <ip>')
ip = sys.argv[1]
if verifyIP(ip) == True:
    try:
        data = getIP(ip)
        alert('IP Address : ' + ip)
        alert('ISP       : ' + data[0])
        alert('Country   : ' + data[1])
        alert('State     : ' + data[2])
        alert('City      : ' + data[3])
    except:
        errorExit('Failed to retrieve IP address information online!')
else:
    error('Invalid IP address!')
    errorExit('Usage : iptrak.py <ip>')