Choose which Kraken API keys to use depending on current MAC address

choose-kraken-key-via-mac.py

from uuid import getnode as mac

# Read Kraken keys
with open("kraken.json") as kraken_keys_file:
    kraken_keys = json.load(kraken_keys_file)

# Identify and choose Kraken API keys based on MAC address
# and return the Kraken object to call the API
def get_kraken_api():
    if str(mac()) in kraken_keys:
        api_key = kraken_keys[str(mac())]["api_key"]
        private_key = kraken_keys[str(mac())]["private_key"]
    else:
        # If no entry found for current MAC address, use random one from config
        msg = "No Kraken API keys found for MAC " + str(mac()) + ". Using random from config"
        updater.bot.send_message(chat_id=config["user_id"], text=msg)
        mac_address, keys_dict = random.choice(list(kraken_keys.items()))
        api_key = keys_dict["api_key"]
        private_key = keys_dict["private_key"]

    # Connect to Kraken
    return krakenex.API(key=api_key, secret=private_key)

The question is, how to get the MAC or any other unique identification of the connected client...