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Object-oriented programming Project 2: Cards!
Goals!
The first project this term takes a closer look at some of the fundamental concepts of
object-oriented programming. !
This project has several parts that can be worked on independently, plus several
extra credit challenges. Your grade will be based on how many parts you finish and
the correctness of each part.!
Reading! !
Introduction to Computing Using Python, sections 6.4–6.5 and 8.1–8.5, plus
resources available on the class web site.!
Programming Projects!
1. Create a file named Card.py and enter the definition of a new class named
Card. Each instance of the class will be a single playing card. !
The constructors should take an integer id between 0 and 51 to specify which
card to make. Cards 0 to 12 are clubs, 13 to 25 diamonds, 26 to 38 hearts, and
39 to 51 spades (see the table below for a description of cards and suits).!
Define three accessor functions:
• rank() should return a number between 0 and 12, where 2s have rank 0 and
aces have rank 12
• suit() should return the suit number, with clubs = 0, diamonds = 1, hearts = 2,
and spades = 3
• points() should return 4 if the card is an ace, 3 if it’s a king, 2 if it’s a queen,
1 if it’s a jack, and 0 otherwise!
Overload the __repr__ function so the representation of a card is a 2-letter
string, and overload the __lt__ operator so cards are compared according to
their ids. !
Here are some examples from an interactive session:!
from Card import *!
x = Card(35)!
x!
J♥!
x.suit()!
2!
x.rank()!
9!
x.points()!
! 1!
CIS 211!
Spring 2014
Note: this design differs
from the one presented in
the text. See the class
notes for more
information.2. Define a new class named BlackjackCard that uses Card as its base class.
Overload the points method so that aces have 11 points, face cards have 10
points, and other cards have their natural value (9, 8, etc down to 2).!
You should also overload the __lt__ operator so cards are compared only by
their rank, with aces highest, then kings, queens, etc.!
y = BlackjackCard(38)!
y!
A♥!
y.points()!
11!
z = BlackjackCard(39)!
z!
2♠!
z.points()!
2!
y < z!
False!
Style points: can you figure out how to have __lt__ use the code you already
wrote to compute the rank of a card?!
To test the function described in the next project you will need a full deck of cards.
The easiest way to make a list of Card objects is to use list comprehension:!
deck = [Card(i) for i in range(52)]!
This statement makes a list of Blackjack cards:!
blackjack_deck = [BlackjackCard(i) for i in range(52)]!
After you have a deck of cards you can use a function named sample from Python’s
random library to deal a hand:!
from random import sample!
hand = sample(deck, 5)!
hand!
[5♦, 3♦, K♠, J♠, 9♣]!
3. Define a function named points that will take a list of cards and return the sum
of the point values of the cards. Here is an example using the hand shown
above:!
points(hand)!
4!
And here is an example using BlackjackCard objects:!
bj_hand = sample(blackjack_deck,3)!
bj_hand!
[7♦, 10♦, 9♥]!
points(bj_hand)!
26 ! !
Style points: can you write this function using Python’s built-in function named
sum so it only takes one expression to implement the function?!Extra Credit Ideas!
• Have the Card constructor check to make sure its argument is between 0 and 51
and raise an exception otherwise.!
• Allow users to pass a specified rank and suit to the Card constructor, for example
have Card(‘A’,’\u2660’) return the same object as Card(51). Another
variation is to allow users to pass a single string, e.g. Card(‘A♠’).!
• Write a function named new_deck that will create a list of cards of a specified type.
The argument should be the name of the class that specifies which type of card to
make (if no argument is passed make a list of standard cards):!
new_deck(Card)!
[2♣, 3♣, 4♣, … Q♠, K♠, A♠]!
new_deck(BlackjackCard)!
[2♣, 3♣, 4♣, … Q♠, K♠, A♠]!
Testing!
We will test your classes and functions by running the tests in a file named
test_Cards.py. You can download the file and run the tests yourself before you
submit your project. This is what you will see in your shell window when your code
passes all the tests:!
$ python3 -m unittest test_Cards.py!
...!
---------------------------------------------------------!
Ran 3 tests in 0.000s ! !
OK!
!
Card Names and Symbols!
This table shows the name and suit symbols used in a standard deck of playing
cards. For suits you can use Unicode symbols or (if your terminal window or IDE is
having issues with Unicode) just print a single letter.!
Card names use the numbers 2 through 10, and then letters J (for jack), Q (for
queen), K (for king), and A (for ace). Here are the first 13 cards in the deck, showing
each card name:!
[Card(i) for i in range(13)]!
[2♣, 3♣, 4♣, 5♣, 6♣, 7♣, 8♣, 9♣, 10♣, J♣, Q♣, K♣, A♣]!
Suits are clubs (♣), diamonds (♦), hearts (♥), and spades (♠). This expression
shows the ace of each suit:!
[Card(i) for i in range(12, 52, 13)]!
[A♣, A♦, A♥, A♠]!
!
See the lecture notes for
an explanation of how
Python’s unittest module
will check your code. ! !
Note: test_Cards.py
must be in the same
directory as your
Card.py file.
The first project this term takes a closer look at some of the fundamental concepts of
object-oriented programming. !
This project has several parts that can be worked on independently, plus several
extra credit challenges. Your grade will be based on how many parts you finish and
the correctness of each part.!
Reading! !
Introduction to Computing Using Python, sections 6.4–6.5 and 8.1–8.5, plus
resources available on the class web site.!
Programming Projects!
1. Create a file named Card.py and enter the definition of a new class named
Card. Each instance of the class will be a single playing card. !
The constructors should take an integer id between 0 and 51 to specify which
card to make. Cards 0 to 12 are clubs, 13 to 25 diamonds, 26 to 38 hearts, and
39 to 51 spades (see the table below for a description of cards and suits).!
Define three accessor functions:
• rank() should return a number between 0 and 12, where 2s have rank 0 and
aces have rank 12
• suit() should return the suit number, with clubs = 0, diamonds = 1, hearts = 2,
and spades = 3
• points() should return 4 if the card is an ace, 3 if it’s a king, 2 if it’s a queen,
1 if it’s a jack, and 0 otherwise!
Overload the __repr__ function so the representation of a card is a 2-letter
string, and overload the __lt__ operator so cards are compared according to
their ids. !
Here are some examples from an interactive session:!
from Card import *!
x = Card(35)!
x!
J♥!
x.suit()!
2!
x.rank()!
9!
x.points()!
! 1!
CIS 211!
Spring 2014
Note: this design differs
from the one presented in
the text. See the class
notes for more
information.2. Define a new class named BlackjackCard that uses Card as its base class.
Overload the points method so that aces have 11 points, face cards have 10
points, and other cards have their natural value (9, 8, etc down to 2).!
You should also overload the __lt__ operator so cards are compared only by
their rank, with aces highest, then kings, queens, etc.!
y = BlackjackCard(38)!
y!
A♥!
y.points()!
11!
z = BlackjackCard(39)!
z!
2♠!
z.points()!
2!
y < z!
False!
Style points: can you figure out how to have __lt__ use the code you already
wrote to compute the rank of a card?!
To test the function described in the next project you will need a full deck of cards.
The easiest way to make a list of Card objects is to use list comprehension:!
deck = [Card(i) for i in range(52)]!
This statement makes a list of Blackjack cards:!
blackjack_deck = [BlackjackCard(i) for i in range(52)]!
After you have a deck of cards you can use a function named sample from Python’s
random library to deal a hand:!
from random import sample!
hand = sample(deck, 5)!
hand!
[5♦, 3♦, K♠, J♠, 9♣]!
3. Define a function named points that will take a list of cards and return the sum
of the point values of the cards. Here is an example using the hand shown
above:!
points(hand)!
4!
And here is an example using BlackjackCard objects:!
bj_hand = sample(blackjack_deck,3)!
bj_hand!
[7♦, 10♦, 9♥]!
points(bj_hand)!
26 ! !
Style points: can you write this function using Python’s built-in function named
sum so it only takes one expression to implement the function?!Extra Credit Ideas!
• Have the Card constructor check to make sure its argument is between 0 and 51
and raise an exception otherwise.!
• Allow users to pass a specified rank and suit to the Card constructor, for example
have Card(‘A’,’\u2660’) return the same object as Card(51). Another
variation is to allow users to pass a single string, e.g. Card(‘A♠’).!
• Write a function named new_deck that will create a list of cards of a specified type.
The argument should be the name of the class that specifies which type of card to
make (if no argument is passed make a list of standard cards):!
new_deck(Card)!
[2♣, 3♣, 4♣, … Q♠, K♠, A♠]!
new_deck(BlackjackCard)!
[2♣, 3♣, 4♣, … Q♠, K♠, A♠]!
Testing!
We will test your classes and functions by running the tests in a file named
test_Cards.py. You can download the file and run the tests yourself before you
submit your project. This is what you will see in your shell window when your code
passes all the tests:!
$ python3 -m unittest test_Cards.py!
...!
---------------------------------------------------------!
Ran 3 tests in 0.000s ! !
OK!
!
Card Names and Symbols!
This table shows the name and suit symbols used in a standard deck of playing
cards. For suits you can use Unicode symbols or (if your terminal window or IDE is
having issues with Unicode) just print a single letter.!
Card names use the numbers 2 through 10, and then letters J (for jack), Q (for
queen), K (for king), and A (for ace). Here are the first 13 cards in the deck, showing
each card name:!
[Card(i) for i in range(13)]!
[2♣, 3♣, 4♣, 5♣, 6♣, 7♣, 8♣, 9♣, 10♣, J♣, Q♣, K♣, A♣]!
Suits are clubs (♣), diamonds (♦), hearts (♥), and spades (♠). This expression
shows the ace of each suit:!
[Card(i) for i in range(12, 52, 13)]!
[A♣, A♦, A♥, A♠]!
!
See the lecture notes for
an explanation of how
Python’s unittest module
will check your code. ! !
Note: test_Cards.py
must be in the same
directory as your
Card.py file.
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