def _validate(self):
all_cards = set()
for hand in self.hands:
for suit in SUITS:
for card in hand.cards_in_suit(suit):
card_identifier = Card.identifier_for_card(suit, card)
assert card_identifier not in all_cards, ("Already seen %s" % Card.card_name(suit, card))
all_cards.add(card_identifier)
assert len(all_cards) == 52
def old_identifier(self):
# We're constructing a 52 digit number in base 4,
# converted to base-10, its our identifier.
identifier = 0
for position, hand in enumerate(self.hands):
for suit, cards in enumerate(hand.cards_by_suit):
for card in cards:
card_identifier = Card.identifier_for_card(suit, card)
identifier += position * pow(4, card_identifier)
return str(identifier)
def identifier(self):
position_for_card = [None for _ in range(52)]
for position, hand in enumerate(self.hands):
for suit, cards in enumerate(hand.cards_by_suit):
for card in cards:
card_identifier = Card.identifier_for_card(suit, card)
position_for_card[card_identifier] = position
# position_for_card represents a 52-digit number in base 4
# We're going to split it into 4-digit hunks and convert to base 16.
identifier = ""
hex_chars = '0123456789abcdef'
for offset in range(26):
# A single hex digit encodes 4 bits where as our previous encoding was 2.
hex_index = position_for_card[offset * 2 + 0] * 4 + position_for_card[offset * 2 + 1]
identifier += hex_chars[hex_index]
return identifier
