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_index, cards in enumerate(hand.cards_by_suit_index):
for card in cards:
suit = Suit.from_index(suit_index)
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_index, hand in enumerate(self.hands):
for suit_index, cards in enumerate(hand.cards_by_suit_index):
for card in cards:
suit = Suit.from_index(suit_index)
card_identifier = Card.identifier_for_card(suit, card)
position_for_card[card_identifier] = position_index
# 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