Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Here is a transcription of the Python code for the `Card` class, typically implemented in a card game system to manage individual playing cards. This code snippet utilizes an order dictionary to assign ranks to different card values and defines a few methods for card representation and comparison.

```python
class Card:
    def __init__(self, value, suit):
        self.value = value
        self.suit = suit
        order = {'Ace':1, 'Two':2, 'Three':3, 'Four':4, 'Five':5,
                 'Six':6, 'Seven':7, 'Eight':8, 'Nine':9, 'Ten':10,
                 'Jack':11, 'Queen':12, 'King':13}
        self.rank = order[self.value]

    def __repr__(self):
        return self.value + ' of ' + self.suit

    def __gt__(self, other):
        return self.rank > other.rank and self.suit == 'Hearts'
```

### Explanation:

1. **Initialization (`__init__` method):**
   - The class initializes with `value` and `suit` parameters.
   - It uses a dictionary called `order` to map each card's face value to a numerical rank.
   - The `self.rank` attribute is assigned based on the card's value using this dictionary.

2. **String Representation (`__repr__` method):**
   - Defines how the card is represented as a string, displaying the card's value and suit (e.g., "Ace of Spades").

3. **Comparison (`__gt__` method):**
   - Provides a way to compare two cards.
   - A card is considered greater if it has a higher rank and belongs to the 'Hearts' suit.

Understanding this class allows the implementation of structured and comparable objects representing playing cards in a game.
expand button
Transcribed Image Text:Here is a transcription of the Python code for the `Card` class, typically implemented in a card game system to manage individual playing cards. This code snippet utilizes an order dictionary to assign ranks to different card values and defines a few methods for card representation and comparison. ```python class Card: def __init__(self, value, suit): self.value = value self.suit = suit order = {'Ace':1, 'Two':2, 'Three':3, 'Four':4, 'Five':5, 'Six':6, 'Seven':7, 'Eight':8, 'Nine':9, 'Ten':10, 'Jack':11, 'Queen':12, 'King':13} self.rank = order[self.value] def __repr__(self): return self.value + ' of ' + self.suit def __gt__(self, other): return self.rank > other.rank and self.suit == 'Hearts' ``` ### Explanation: 1. **Initialization (`__init__` method):** - The class initializes with `value` and `suit` parameters. - It uses a dictionary called `order` to map each card's face value to a numerical rank. - The `self.rank` attribute is assigned based on the card's value using this dictionary. 2. **String Representation (`__repr__` method):** - Defines how the card is represented as a string, displaying the card's value and suit (e.g., "Ace of Spades"). 3. **Comparison (`__gt__` method):** - Provides a way to compare two cards. - A card is considered greater if it has a higher rank and belongs to the 'Hearts' suit. Understanding this class allows the implementation of structured and comparable objects representing playing cards in a game.
**Card Class Attributes**

**Prompt**: List all of the instance variables (also known as attributes) of the Card class.

---

This text is a prompt indicating that students should identify and list the attributes associated with a "Card" class. In object-oriented programming, a class can have multiple attributes that define the characteristics or data it maintains. Students might expect typical attributes like:

- **Suit**: Represents the suit of the card (e.g., hearts, diamonds).
- **Rank**: Represents the rank or value of the card (e.g., ace, king).
- **Color**: Optional attribute indicating card color (e.g., red, black).

Students are expected to recognize and list these based on either a provided class definition or their understanding of card-related programming concepts.
expand button
Transcribed Image Text:**Card Class Attributes** **Prompt**: List all of the instance variables (also known as attributes) of the Card class. --- This text is a prompt indicating that students should identify and list the attributes associated with a "Card" class. In object-oriented programming, a class can have multiple attributes that define the characteristics or data it maintains. Students might expect typical attributes like: - **Suit**: Represents the suit of the card (e.g., hearts, diamonds). - **Rank**: Represents the rank or value of the card (e.g., ace, king). - **Color**: Optional attribute indicating card color (e.g., red, black). Students are expected to recognize and list these based on either a provided class definition or their understanding of card-related programming concepts.
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