Generate a random MAC address in Python 3

randomize_mac.py

#!/usr/bin/env python3
# https://gist.github.com/EONRaider/ebda160f27ce0a09f1ab1c7733ba0e8c
__author__ = 'EONRaider, keybase.io/eonraider'

import random


def randomize_mac(*, sep: str = ':') -> str:
    """
    Generates random MAC addresses in the format XX:XX:XX:XX:XX:XX by 
    default, where X is a hexadecimal value.

    Args:
        sep (str): The separator to be applied between each octet. 
            IEEE 802 defines the acceptable characters as ':' and '-'.
    """

    hex_values = '0123456789ABCDEF'
    octets = (''.join(random.choices(hex_values, k=2)) for _ in range(6))

    return sep.join(octets)

if __name__ == '__main__':
    for _ in range(3):
        print(randomize_mac())
        print(randomize_mac(sep='-'))

        # Sample output:
        # A8:5A:15:08:85:91
        # 75-F1-EC-B4-BB-64
        # 19:A5:DC:A1:E1:C2
        # D9-5A-F1-33-B7-B0
        # 7E:FD:95:FF:9E:B5
        # AE-EA-F8-E5-39-4E