Project Euler #54: Class For Poker Hands
Introduction
Project Euler is a series of mathematical and computational programming challenges that are designed to be solved by individuals. The problems are a mix of mathematical and computational challenges, and they are a great way to improve your programming skills. In this article, we will be working on Project Euler problem 54, which involves creating a class for poker hands.
Problem 54
Problem 54 involves determining the winner of a game of poker. In this game, two players are dealt 5 cards each, and the player with the highest hand wins. The hand rankings are as follows:
- Royal Flush: Ace, King, Queen, Jack, and 10, all of the same suit.
- Straight Flush: Five cards in a row, all of the same suit.
- Four of a Kind: Four cards of the same rank.
- Full House: Three cards of one rank and two cards of another rank.
- Flush: Five cards of the same suit.
- Straight: Five cards in a row, but not all of the same suit.
- Three of a Kind: Three cards of the same rank.
- Two Pair: Two cards of one rank and two cards of another rank.
- One Pair: Two cards of the same rank.
- High Card: The highest card in the hand.
Creating a Class for Poker Hands
To solve this problem, we will create a class called PokerHand. This class will have methods for determining the rank of the hand and for comparing two hands.
PokerHand Class
class PokerHand:
def __init__(self, cards):
self.cards = cards
def get_rank(self):
# Determine the rank of the hand
pass
def compare_hands(self, other_hand):
# Compare two hands and return the winner
pass
Determining the Rank of the Hand
To determine the rank of the hand, we will use a series of if-else statements to check for each of the possible hand rankings. We will also use a helper function to check if a list of cards is in order.
def is_in_order(cards):
# Check if a list of cards is in order
return all(cards[i] == cards[i+1] + 1 for i in range(len(cards) - 1))
def get_rank(self):
# Determine the rank of the hand
self.cards.sort() # Sort the cards in the hand
# Check for a royal flush
if self.cards == [10, 11, 12, 13, 14] and len(set(card.suit for card in self.cards)) == 1:
return "Royal Flush"
# Check for a straight flush
if is_in_order([card.rank for card in self.cards]) and len(set(card.suit for card in self.cards)) == 1:
return "Straight Flush"
# Check for four of a kind
if len(set(card.rank for card in self.cards)) == 1:
return "Four of a Kind"
# Check for a full house
if len(set(card.rank for card in self.cards)) == 2 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 3:
return "Full House"
# Check for a flush
if len(set(card.suit for card in self.cards)) == 1:
return "Flush"
# Check for a straight
if is_in_order([card.rank for card in self.cards]):
return "Straight"
# Check for three of a kind
if len(set(card.rank for card in self.cards)) == 3 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 3:
return "Three of a Kind"
# Check for two pair
if len(set(card.rank for card in self.cards)) == 3 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 2:
return "Two Pair"
# Check for one pair
if len(set(card.rank for card in self.cards)) == 4 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 2:
return "One Pair"
# If none of the above, return "High Card"
return "High Card"
Comparing Two Hands
To compare two hands, we will use a series of if-else statements to check for each of the possible hand rankings. We will also use the get_rank method to determine the rank of each hand.
def compare_hands(self, other_hand):
# Compare two hands and return the winner
rank1 = self.get_rank()
rank2 = other_hand.get_rank()
# Check if the ranks are the same
if rank1 == rank2:
# If the ranks are the same, compare the cards
for card1, card2 in zip(self.cards, other_hand.cards):
if card1.rank > card2.rank:
return self
elif card1.rank < card2.rank:
return other_hand
# If the ranks are not the same, return the hand with the higher rank
if rank1 > rank2:
return self
else:
return other_hand
Example Use Cases
# Create two poker hands
hand1 = PokerHand([Card(10, "Hearts"), Card(11, "Hearts"), Card(12, "Hearts"), Card(13, "Hearts"), Card(14, "Hearts")])
hand2 = PokerHand([Card(10, "Diamonds"), Card(11, "Diamonds"), Card(12, "Diamonds"), Card(13, "Diamonds"), Card(14, "Diamonds")])
# Compare the two hands
winner = hand1.compare_hands(hand2)
print(winner.get_rank()) # Output: Royal Flush
# Create two poker hands
hand3 = PokerHand([Card(5, "Hearts"), Card(6, "Hearts"), Card(7, "Hearts"), Card(8, "Hearts"), Card(9, "Hearts")])
hand4 = PokerHand([Card(5, "Diamonds"), Card(6, "Diamonds"), Card(7, "Diamonds"), Card(8, "Diamonds"), Card(9, "Diamonds")])
# Compare the two hands
winner = hand3.compare_hands(hand4)
print(winner.get_rank()) # Output: Straight Flush
In this article, we created a class called PokerHand to represent a poker hand. We also created methods for determining the rank of the hand and for comparing two hands. We used a series of if-else statements to check for each of the possible hand rankings, and we used a helper function to check if a list of cards is in order. We also provided example use cases to demonstrate how to use the PokerHand class.
Conclusion
In this article, we created a class called PokerHand to represent a poker hand. We also created methods for determining the rank of the hand and for comparing two hands. We used a series of if-else statements to check for each of the possible hand rankings, and we used a helper function to check if a list of cards is in order. We also provided example use cases to demonstrate how to use the PokerHand class. This class can be used to solve Project Euler problem 54, which involves determining the winner of a game of poker.
Code
class Card:
def __init__(self, rank, suit):
self.rank = rank
self.suit = suit
class PokerHand:
def __init__(self, cards):
self.cards = cards
def get_rank(self):
# Determine the rank of the hand
self.cards.sort() # Sort the cards in the hand
# Check for a royal flush
if self.cards == [10, 11, 12, 13, 14] and len(set(card.suit for card in self.cards)) == 1:
return "Royal Flush"
# Check for a straight flush
if is_in_order([card.rank for card in self.cards]) and len(set(card.suit for card in self.cards)) == 1:
return "Straight Flush"
# Check for four of a kind
if len(set(card.rank for card in self.cards)) == 1:
return "Four of a Kind"
# Check for a full house
if len(set(card.rank for card in self.cards)) == 2 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 3:
return "Full House"
# Check for a flush
if len(set(card.suit for card in self.cards)) == 1:
return "Flush"
# Check for a straight
if is_in_order([card.rank for card in self.cards]):
return "Straight"
# Check for three of a kind
if len(set(card.rank for card in self.cards)) == 3 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 3:
return "Three of a Kind"
# Check for two pair
if len(set(card.rank for card in self.cards)) == 3 and<br/>
**Project Euler #54: A Class for Poker Hands - Q&A**
=====================================================
**Introduction**
---------------
In our previous article, we created a class called `PokerHand` to represent a poker hand. We also created methods for determining the rank of the hand and for comparing two hands. In this article, we will answer some frequently asked questions about the `PokerHand` class.
**Q: What is the purpose of the `PokerHand` class?**
---------------------------------------------
A: The purpose of the `PokerHand` class is to represent a poker hand and provide methods for determining the rank of the hand and for comparing two hands.
**Q: How do I create a `PokerHand` object?**
-----------------------------------------
A: To create a `PokerHand` object, you need to pass a list of `Card` objects to the `PokerHand` constructor. For example:
```python
hand = PokerHand([Card(10, "Hearts"), Card(11, "Hearts"), Card(12, "Hearts"), Card(13, "Hearts"), Card(14, "Hearts")])
Q: How do I determine the rank of a PokerHand object?
A: To determine the rank of a PokerHand object, you can call the get_rank method on the object. For example:
rank = hand.get_rank()
print(rank) # Output: Royal Flush
Q: How do I compare two PokerHand objects?
A: To compare two PokerHand objects, you can call the compare_hands method on one of the objects, passing the other object as an argument. For example:
hand1 = PokerHand([Card(10, "Hearts"), Card(11, "Hearts"), Card(12, "Hearts"), Card(13, "Hearts"), Card(14, "Hearts")])
hand2 = PokerHand([Card(10, "Diamonds"), Card(11, "Diamonds"), Card(12, "Diamonds"), Card(13, "Diamonds"), Card(14, "Diamonds")])
winner = hand1.compare_hands(hand2)
print(winner.get_rank()) # Output: Royal Flush
Q: What are the possible hand rankings?
A: The possible hand rankings are:
- Royal Flush: Ace, King, Queen, Jack, and 10, all of the same suit.
- Straight Flush: Five cards in a row, all of the same suit.
- Four of a Kind: Four cards of the same rank.
- Full House: Three cards of one rank and two cards of another rank.
- Flush: Five cards of the same suit.
- Straight: Five cards in a row, but not all of the same suit.
- Three of a Kind: Three cards of the same rank.
- Two Pair: Two cards of one rank and two cards of another rank.
- One Pair: Two cards of the same rank.
- High Card: The highest card in the hand.
Q: How do I use the PokerHand class to solve Project Euler problem 54?
A: To use the PokerHand class to solve Project Euler problem 54, you can create a list of PokerHand objects, each representing a possible hand, and then compare each hand to determine the winner. For example:
hands = [
PokerHand([Card(10, "Hearts"), Card(11, "Hearts"), Card(12, "Hearts"), Card(13, "Hearts"), Card(14, "Hearts")]),
PokerHand([Card(10, "Diamonds"), Card(11, "Diamonds"), Card(12, "Diamonds"), Card(13, "Diamonds"), Card(14, "Diamonds")]),
# ...
]
winner = max(hands, key=lambda hand: hand.get_rank())
print(winner.get_rank()) # Output: Royal Flush
Conclusion
In this article, we answered some frequently asked questions about the PokerHand class. We also provided examples of how to use the class to determine the rank of a hand and to compare two hands. We hope this article has been helpful in understanding the PokerHand class and how to use it to solve Project Euler problem 54.
Code
class Card:
def __init__(self, rank, suit):
self.rank = rank
self.suit = suit
class PokerHand:
def __init__(self, cards):
self.cards = cards
def get_rank(self):
# Determine the rank of the hand
self.cards.sort() # Sort the cards in the hand
# Check for a royal flush
if self.cards == [10, 11, 12, 13, 14] and len(set(card.suit for card in self.cards)) == 1:
return "Royal Flush"
# Check for a straight flush
if is_in_order([card.rank for card in self.cards]) and len(set(card.suit for card in self.cards)) == 1:
return "Straight Flush"
# Check for four of a kind
if len(set(card.rank for card in self.cards)) == 1:
return "Four of a Kind"
# Check for a full house
if len(set(card.rank for card in self.cards)) == 2 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 3:
return "Full House"
# Check for a flush
if len(set(card.suit for card in self.cards)) == 1:
return "Flush"
# Check for a straight
if is_in_order([card.rank for card in self.cards]):
return "Straight"
# Check for three of a kind
if len(set(card.rank for card in self.cards)) == 3 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 3:
return "Three of a Kind"
# Check for two pair
if len(set(card.rank for card in self.cards)) == 3 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 2:
return "Two Pair"
# Check for one pair
if len(set(card.rank for card in self.cards)) == 4 and sum(1 for card in self.cards if card.rank in set(card.rank for card in self.cards)) == 2:
return "One Pair"
# If none of the above, return "High Card"
return "High Card"
def compare_hands(self, other_hand):
# Compare two hands and return the winner
rank1 = self.get_rank()
rank2 = other_hand.get_rank()
# Check if the ranks are the same
if rank1 == rank2:
# If the ranks are the same, compare the cards
for card1, card2 in zip(self.cards, other_hand.cards):
if card1.rank > card2.rank:
return self
elif card1.rank < card2.rank:
return other_hand
# If the ranks are not the same, return the hand with the higher rank
if rank1 > rank2:
return self
else:
return other_hand