Generate base36 encoded host names (xip.io)

xip-io.py

#!/usr/bin/python3

import ipaddress
import sys

# SO one :)


def base36encode(number):
    """
    Base 36 encoder function
    """
    if not isinstance(number, (int)):
        raise TypeError('number must be an integer')
    if number < 0:
        raise ValueError('number must be positive')

    alphabet, base36 = ['0123456789abcdefghijklmnopqrstuvwxyz', '']

    while number:
        number, i = divmod(number, 36)
        base36 = alphabet[i] + base36

    return base36 or alphabet[0]


def base36decode(number):
    """
    base 36 decode...
    """
    return int(number, 36)

if len(sys.argv) < 2:
    sys.exit('Usage: %s <IP address>' % sys.argv[0])
IP = sys.argv[1].split('.')
if len(IP) < 4:                                                                                        
    sys.exit('<IP address> not in correct form')                                                       
                                                                                                       
                                                                                                       
B36NAME = base36encode(int(ipaddress.ip_address(                                                       
    u'{}.{}.{}.{}'.format(IP[3], IP[2], IP[1], IP[0]))))                                               
print("IP {}\nXIP_b36 http://{}.xip.io\nXIP_SSL https://{}.xip.io\nXIP_plain http://{}.xip.io".format( 
    sys.argv[1], B36NAME, B36NAME, sys.argv[1]))