primeiro commit com exercicios de Exercism realizados até esta data

python/black-jack/black_jack.py

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