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110 lines
3.1 KiB
Python
110 lines
3.1 KiB
Python
"""Functions to help play and score a game of blackjack.
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How to play blackjack: https://bicyclecards.com/how-to-play/blackjack/
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"Standard" playing cards: https://en.wikipedia.org/wiki/Standard_52-card_deck
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"""
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def value_of_card(card):
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"""Determine the scoring value of a card.
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:param card: str - given card.
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:return: int - value of a given card. See below for values.
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1. 'J', 'Q', or 'K' (otherwise known as "face cards") = 10
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2. 'A' (ace card) = 1
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3. '2' - '10' = numerical value.
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"""
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res = 0
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if card >= "J":
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res = 10
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elif card == "A":
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res = 1
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else:
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res = int(card)
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return res
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def higher_card(card_one, card_two):
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"""Determine which card has a higher value in the hand.
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:param card_one, card_two: str - cards dealt in hand. See below for values.
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:return: str or tuple - resulting Tuple contains both cards if they are of equal value.
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1. 'J', 'Q', or 'K' (otherwise known as "face cards") = 10
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2. 'A' (ace card) = 1
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3. '2' - '10' = numerical value.
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"""
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card_one_val = value_of_card(card_one)
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card_two_val = value_of_card(card_two)
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if card_one_val == card_two_val:
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return (card_one, card_two)
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if card_one_val > card_two_val:
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return card_one
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return card_two
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def value_of_ace(card_one, card_two):
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"""Calculate the most advantageous value for the ace card.
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:param card_one, card_two: str - card dealt. See below for values.
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:return: int - either 1 or 11 value of the upcoming ace card.
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1. 'J', 'Q', or 'K' (otherwise known as "face cards") = 10
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2. 'A' (ace card) = 11 (if already in hand)
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3. '2' - '10' = numerical value.
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"""
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if (value_of_card(card_one) + value_of_card(card_two) >= 11) or "A" in (
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card_one,
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card_two,
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):
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return 1
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return 11
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def is_blackjack(card_one, card_two):
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"""Determine if the hand is a 'natural' or 'blackjack'.
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:param card_one, card_two: str - card dealt. See below for values.
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:return: bool - is the hand is a blackjack (two cards worth 21).
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1. 'J', 'Q', or 'K' (otherwise known as "face cards") = 10
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2. 'A' (ace card) = 11 (if already in hand)
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3. '2' - '10' = numerical value.
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"""
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if card_one != "A" and card_two != "A":
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return False
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if card_one == "A":
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return value_of_card(card_two) + 11 == 21
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return value_of_card(card_one) + 11 == 21
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def can_split_pairs(card_one, card_two):
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"""Determine if a player can split their hand into two hands.
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:param card_one, card_two: str - cards dealt.
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:return: bool - can the hand be split into two pairs? (i.e. cards are of the same value).
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"""
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return value_of_card(card_one) == value_of_card(card_two)
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def can_double_down(card_one, card_two):
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"""Determine if a blackjack player can place a double down bet.
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:param card_one, card_two: str - first and second cards in hand.
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:return: bool - can the hand can be doubled down? (i.e. totals 9, 10 or 11 points).
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"""
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return 9 <= value_of_card(card_one) + value_of_card(card_two) <= 11
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