10.6 Case Study: Card Shuffling and Dealing Simulation

  • Class Card represents a playing card that has a face ('Ace', '2', '3', …, 'Jack', 'Queen', 'King') and a suit ('Hearts', 'Diamonds', 'Clubs', 'Spades')
  • Class DeckOfCards represents a deck of 52 playing cards as a list of Card objects

10.6.1 Test-Driving Classes Card and DeckOfCards

Before we look at classes Card and DeckOfCards, let’s use an IPython session to demonstrate their capabilities.

Creating, Shuffling and Dealing the Cards

In [1]:
from deck import DeckOfCards
In [2]:
deck_of_cards = DeckOfCards()
  • DeckOfCards method __init__ creates the 52 Card objects in order by suit and by face within each suit
  • Printing a deck_of_cards object calls its __str__ method
In [3]:
print(deck_of_cards)

Ace of Hearts      2 of Hearts        3 of Hearts        4 of Hearts        
5 of Hearts        6 of Hearts        7 of Hearts        8 of Hearts        
9 of Hearts        10 of Hearts       Jack of Hearts     Queen of Hearts    
King of Hearts     Ace of Diamonds    2 of Diamonds      3 of Diamonds      
4 of Diamonds      5 of Diamonds      6 of Diamonds      7 of Diamonds      
8 of Diamonds      9 of Diamonds      10 of Diamonds     Jack of Diamonds   
Queen of Diamonds  King of Diamonds   Ace of Clubs       2 of Clubs         
3 of Clubs         4 of Clubs         5 of Clubs         6 of Clubs         
7 of Clubs         8 of Clubs         9 of Clubs         10 of Clubs        
Jack of Clubs      Queen of Clubs     King of Clubs      Ace of Spades      
2 of Spades        3 of Spades        4 of Spades        5 of Spades        
6 of Spades        7 of Spades        8 of Spades        9 of Spades        
10 of Spades       Jack of Spades     Queen of Spades    King of Spades
  • Shuffle the deck and print the deck_of_cards object again
In [4]:
deck_of_cards.shuffle()
In [5]:
print(deck_of_cards)

8 of Diamonds      8 of Clubs         7 of Clubs         Queen of Diamonds  
10 of Spades       2 of Clubs         10 of Hearts       6 of Diamonds      
5 of Hearts        Queen of Spades    7 of Hearts        5 of Clubs         
9 of Hearts        King of Hearts     9 of Clubs         6 of Hearts        
2 of Spades        10 of Diamonds     6 of Spades        5 of Spades        
10 of Clubs        3 of Spades        Ace of Spades      2 of Diamonds      
Ace of Diamonds    4 of Hearts        3 of Diamonds      8 of Hearts        
Queen of Hearts    2 of Hearts        8 of Spades        Queen of Clubs     
Jack of Hearts     3 of Clubs         Ace of Hearts      9 of Spades        
7 of Diamonds      4 of Clubs         Jack of Spades     5 of Diamonds      
4 of Diamonds      6 of Clubs         Ace of Clubs       King of Diamonds   
3 of Hearts        7 of Spades        Jack of Diamonds   King of Spades     
Jack of Clubs      King of Clubs      9 of Diamonds      4 of Spades

Dealing Cards

  • Can deal one Card at a time by calling method deal_card
  • IPython calls the returned Card object’s __repr__ method to produce the string output
In [6]:
deck_of_cards.deal_card()
Out[6]:
Card(face='8', suit='Diamonds')

Class Card’s Other Features

  • Deal another card and pass it to the built-in str function
In [7]:
card = deck_of_cards.deal_card()
In [8]:
str(card)
Out[8]:
'8 of Clubs'
  • Each Card has a corresponding image file name, which you can get via the image_name read-only property
    • Used when we display the Cards as images
In [9]:
card.image_name
Out[9]:
'8_of_Clubs.png'

©1992–2020 by Pearson Education, Inc. All Rights Reserved. This content is based on Chapter 5 of the book Intro to Python for Computer Science and Data Science: Learning to Program with AI, Big Data and the Cloud.

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