# CECS 277 – Lab 6 – Class Relationships solution

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## Yahtzee

Create a dice game that awards the user points for pair, three-of-a-kind, or a series. Use the
following class diagram for your program.

Die class (die.py) – has two attributes: the number of sides of the die and the value of the rolled
die.
1. __init__(self, sides=6) – assigns the number of sides from the value passed in. Set
value to 0 or to the returned value of roll().

2. roll(self) – generate a random number between 1 and the number of sides and assign
it to the Die’s value. Return the value.
3. __str__(self) – return the Die’s value as a string.

4. __lt__(self, other) – return true if the value of self is less than the value of other.
5. __eq__(self, other) – return true if both the values of self and other are equal.
6. __sub__(self, other) – return the difference between the value of self and the value
of other.

Player class (player.py) – has two attributes: a list of 3 Die objects and the player’s points.
1. __init__(self) – constructs and sorts the list of three Die objects and initializes the
player’s points to 0.
2. get_points(self) – returns the player’s points.

3. roll_dice(self) – calls roll on each of the Die objects in the dice list and sorts the list.
4. has_pair(self) – returns true if two dice in the list have the same value (uses ==).
Increments points by 1.

5. has_three_of_a_kind(self) – returns true if all three dice in the list have the same
value (uses ==). Increments points by 3.
6. has_series(self) – returns true if the values of each of the dice in the list are in a
sequence (ex. 1,2,3 or 2,3,4 or 3,4,5 or 4,5,6) (uses -). Increments points by 2.

7. __str__(self) – returns a string in the format: “D1=2, D2=4, D3=6”.
Main file (main.py) – has one function named take_turn that passes in a Player object. The
take_turn function should: roll the player’s dice, display the dice, check for and display any win
types (pair, series, three-of-a-kind), and display the updated score.

The main function should
construct a player object, and then repeatedly call take_turn until the user chooses to end the
game. Display the final points at the end of the game. Use the check_input module’s
get_yes_no function to prompt the user to continue or end the game. Use docstrings to document
each class, method, and function.

Example Output (user input in italics):
-YahtzeeD1=1 D2=4 D3=5
Score = 0
Play again? (Y/N): g
Invalid input – should be a ‘Yes’
or ‘No’.
Play again? (Y/N): y
D1=3 D2=3 D3=5
You got a pair!
Score = 1
Play again? (Y/N): y
D1=3 D2=4 D3=5
You got a series of 3!
Score = 3
Play again? (Y/N): y
D1=1 D2=1 D3=1
You got 3 of a kind!
Score = 6
Play again? (Y/N): n
Game Over.
Final Score = 6

Notes:
1. You should have 4 different files: die.py, player.py, check_input.py, and main.py.
2. Check all user input using the get_yes_no function in the check_input module.
3. Do not create any extra methods or add any extra parameters.

4. Please do not create any global variables or use the attributes globally. Only access the
attributes using the class’s methods.
5. Do not call any of the methods using the double underscores (ex. use == not __eq__).

6. Use docstrings to document the class, each of its methods, and the functions in the main
file. See the lecture notes and the Coding Standards reference document for examples.
7. Place your names, date, and a brief description of the program in a comment block at the