generates a mac address in the mikrotik bridge range

gen_mac.py

#!/usr/bin/env python

# 00:00:5E:80:00:00 - 00:00:5E:FF:FF:FF

import random
from os.path import expanduser

def rand_mac():
    return "%02x:%02x:%02x:%02x:%02x:%02x" % (
        0, 0, 94,
        random.randint(128, 255),
        random.randint(0, 255),
        random.randint(0, 255)
        )

def store_mac(mac):
    home = expanduser("~")
    hrm = open(home + "/.random_mac","a")
    hrm.write(mac + "\n")
    hrm.close() 

def check_mac(mac):
    matched = False
    home = expanduser("~")
    file = open(home + "/.random_mac","r")
    for line in file:
        line = line.rstrip('\n')
        if line == mac:
            matched = True
    return matched

macaddy = rand_mac()

while check_mac(macaddy) == True:
    macaddy = rand_mac()

print macaddy
store_mac(macaddy)