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to Yacht in the Python Track

Published at Jul 13 2018 · 0 comments
Instructions
Test suite
Solution

Note:

This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

Score a single throw of dice in Yacht

The dice game Yacht is from the same family as Poker Dice, Generala and particularly Yahtzee, of which it is a precursor. In the game, five dice are rolled and the result can be entered in any of twelve categories. The score of a throw of the dice depends on category chosen.

Scores in Yacht

Category    Score                   Example
Ones            1 × number of ones      1 1 1 4 5 scores 3
Twos            2 × number of twos      2 2 3 4 5 scores 4
Threes          3 × number of threes    3 3 3 3 3 scores 15
Fours           4 × number of fours     1 2 3 3 5 scores 0
Fives           5 × number of fives     5 1 5 2 5 scores 15
Sixes           6 × number of sixes     2 3 4 5 6 scores 6
Full House      Total of the dice       3 3 3 5 5 scores 19
Four of a Kind  Total of the four dice  4 4 4 4 6 scores 16
Little Straight 30 points               1 2 3 4 5 scores 30
Big Straight    30 points               2 3 4 5 6 scores 30
Choice          Sum of the dice         2 3 3 4 6 scores 18
Yacht           50 points               4 4 4 4 4 scores 50

If the dice do not satisfy the requirements of a category, the score is zero. If, for example, Four Of A Kind is entered in the Yacht category, zero points are scored. A Yacht scores zero if entered in the Full House category.

Task

Given a list of values for five dice and a category, your solution should return the score of the dice for that category. If the dice do not satisfy the requirements of the category your solution should return 0. You can assume that five values will always be presented, and the value of each will be between one and six inclusively. You should not assume that the dice are ordered.

Exception messages

Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include a message.

To raise a message with an exception, just write it as an argument to the exception type. For example, instead of raise Exception, you should write:

raise Exception("Meaningful message indicating the source of the error")

Running the tests

To run the tests, run the appropriate command below (why they are different):

  • Python 2.7: py.test yacht_test.py
  • Python 3.4+: pytest yacht_test.py

Alternatively, you can tell Python to run the pytest module (allowing the same command to be used regardless of Python version): python -m pytest yacht_test.py

Common pytest options

  • -v : enable verbose output
  • -x : stop running tests on first failure
  • --ff : run failures from previous test before running other test cases

For other options, see python -m pytest -h

Submitting Exercises

Note that, when trying to submit an exercise, make sure the solution is in the $EXERCISM_WORKSPACE/python/yacht directory.

You can find your Exercism workspace by running exercism debug and looking for the line that starts with Workspace.

For more detailed information about running tests, code style and linting, please see the help page.

Source

James Kilfiger, using wikipedia https://en.wikipedia.org/wiki/Yacht_(dice_game)

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

yacht_test.py

import unittest

import yacht
from yacht import score


# Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0

class YachtTest(unittest.TestCase):
    def test_yacht(self):
        self.assertEqual(score([5, 5, 5, 5, 5], yacht.YACHT), 50)

    def test_not_yacht(self):
        self.assertEqual(score([1, 3, 3, 2, 5], yacht.YACHT), 0)

    def test_ones(self):
        self.assertEqual(score([1, 1, 1, 3, 5], yacht.ONES), 3)

    def test_ones_out_of_order(self):
        self.assertEqual(score([3, 1, 1, 5, 1], yacht.ONES), 3)

    def test_no_ones(self):
        self.assertEqual(score([4, 3, 6, 5, 5], yacht.ONES), 0)

    def test_twos(self):
        self.assertEqual(score([2, 3, 4, 5, 6], yacht.TWOS), 2)

    def test_fours(self):
        self.assertEqual(score([1, 4, 1, 4, 1], yacht.FOURS), 8)

    def test_yacht_counted_as_threes(self):
        self.assertEqual(score([3, 3, 3, 3, 3], yacht.THREES), 15)

    def test_yacht_of_threes_counted_as_fives(self):
        self.assertEqual(score([3, 3, 3, 3, 3], yacht.FIVES), 0)

    def test_sixes(self):
        self.assertEqual(score([2, 3, 4, 5, 6], yacht.SIXES), 6)

    def test_full_house_two_small_three_big(self):
        self.assertEqual(score([2, 2, 4, 4, 4], yacht.FULL_HOUSE), 16)

    def test_full_house_three_small_two_big(self):
        self.assertEqual(score([5, 3, 3, 5, 3], yacht.FULL_HOUSE), 19)

    def test_two_pair_is_not_a_full_house(self):
        self.assertEqual(score([2, 2, 4, 4, 5], yacht.FULL_HOUSE), 0)

    def test_four_of_a_kind_is_not_a_full_house(self):
        self.assertEqual(score([1, 4, 4, 4, 4], yacht.FULL_HOUSE), 0)

    def test_yacht_is_not_a_full_house(self):
        self.assertEqual(score([2, 2, 2, 2, 2], yacht.FULL_HOUSE), 0)

    def test_four_of_a_kind(self):
        self.assertEqual(score([6, 6, 4, 6, 6], yacht.FOUR_OF_A_KIND), 24)

    def test_yacht_can_be_scored_as_four_of_a_kind(self):
        self.assertEqual(score([3, 3, 3, 3, 3], yacht.FOUR_OF_A_KIND), 12)

    def test_full_house_is_not_four_of_a_kind(self):
        self.assertEqual(score([3, 5, 4, 1, 2], yacht.FOUR_OF_A_KIND), 0)

    def test_little_straight(self):
        self.assertEqual(score([3, 5, 4, 1, 2], yacht.LITTLE_STRAIGHT), 30)

    def test_little_straight_as_big_straight(self):
        self.assertEqual(score([1, 2, 3, 4, 5], yacht.BIG_STRAIGHT), 0)

    def test_four_in_order_but_not_a_little_straight(self):
        self.assertEqual(score([1, 1, 2, 3, 4], yacht.LITTLE_STRAIGHT), 0)

    def test_no_pairs_but_not_a_little_straight(self):
        self.assertEqual(score([1, 2, 3, 4, 6], yacht.LITTLE_STRAIGHT), 0)

    def test_min_1_max_5_but_not_a_little_straight(self):
        self.assertEqual(score([1, 1, 3, 4, 5], yacht.LITTLE_STRAIGHT), 0)

    def test_big_straight(self):
        self.assertEqual(score([4, 6, 2, 5, 3], yacht.BIG_STRAIGHT), 30)

    def test_big_straight_as_little_straight(self):
        self.assertEqual(score([6, 5, 4, 3, 2], yacht.LITTLE_STRAIGHT), 0)

    def test_choice(self):
        self.assertEqual(score([3, 3, 5, 6, 6], yacht.CHOICE), 23)

    def test_yacht_as_choice(self):
        self.assertEqual(score([2, 2, 2, 2, 2], yacht.CHOICE), 10)


if __name__ == '__main__':
    unittest.main()
import math

# Score categories
# Change the values as you see fit
YACHT = 'Yacht'
ONES = 1
TWOS = 2
THREES = 3
FOURS = 4
FIVES = 5
SIXES = 6
FULL_HOUSE = 'Full House'
FOUR_OF_A_KIND = 'Four of a Kind'
LITTLE_STRAIGHT = 'Little Straight'
BIG_STRAIGHT = 'Big Straight'
CHOICE = 'Choice'


def score_n(dice, n):
    x = dice.count(n)
    return n * x


def score_yacht(dice):
    die = dice[0]
    for value in range(1, 5):
        if die != dice[value]:
            return 0
    return 50


def score_full_house(dice):
    dice.sort()
    a = dice.count(dice[0])
    b = dice.count(dice[4])
    if (a == 3 and b == 2) or (a == 2 and b == 3):
        return int(math.fsum(dice))
    else:
        return 0

def score_four_of_a_kind(dice):
    dice.sort()
    a = dice[0]
    b = dice[4]
    if dice.count(a) >= 4:
        return 4 * a
    elif dice.count(b) >= 4:
        return 4 * b
    else:
        return 0


def score_little_straight(dice):
    dice.sort()
    if dice == [1, 2, 3, 4, 5]:
        return 30
    else:
        return 0


def score_big_straight(dice):
    dice.sort()
    if dice == [2, 3, 4, 5, 6]:
        return 30
    else:
        return 0


def score_choice(dice):
    return int(math.fsum(dice))


def score(dice, category):
    if category == YACHT:
        return score_yacht(dice)
    elif category == FULL_HOUSE:
        return score_full_house(dice)
    elif category == FOUR_OF_A_KIND:
        return score_four_of_a_kind(dice)
    elif category == LITTLE_STRAIGHT:
        return score_little_straight(dice)
    elif category == BIG_STRAIGHT:
        return score_big_straight(dice)
    elif category == CHOICE:
        return score_choice(dice)
    elif category in [ONES, TWOS, THREES, FOURS, FIVES, SIXES]:
        return score_n(dice, category)
    else:
        raise Exception('\'%s\': Invalid category', category)

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