(card_one, card_two)
return blackjack
:param card_one: str - first card in hand.
    :param card_two: str - second card in hand.
    :return: bool - if the hand is a blackjack (two cards worth 21).
def is_blackjack(card_one, card_two):
    """

    :param card_one: str - first card in hand.
    :param card_two: str - second card in hand.
    :return: bool - if the hand is a blackjack (two cards worth 21).
    """

    if card_one == 'A' and card_two != 'A':
        blackjack = value_of_card(card_two) == 10
    elif card_one != 'A' and card_two == 'A':
        blackjack = value_of_card(card_one) == 10
    else:
        blackjack = False
    return blackjack
def is_blackjack ( card_one , card_two ) : if card_one == 'A' and card_two != 'A' : blackjack = value_of_card ( card_two ) == 10 elif card_one != 'A' and card_two == 'A' : blackjack = value_of_card ( card_one ) == 10 else : blackjack = False return blackjack