# hmc.py
import hmac
import hashlib


def calc_digest(key, message):
    key = bytes(key, 'utf-8')
    message = bytes(message, 'utf-8')

    dig = hmac.new(key, message, hashlib.sha256)
    return dig.hexdigest()


mac = calc_digest('secret-key', 'Important Message')
print(mac)